Looking at projectiles recovered from a Glock 19 I see flats and then the female rounded corners just as you have described. Great informational video.
Dick Trickles - If you or I had been employed by Glock, we would have done just that = 1) patent that rifling process 2) create more distinctiveness to add to that of the Glock "safe action", Glock trigger etc. 3) more branding 4) eliminate confusion over the "polygon" since the company was not going to explain how they actually got their rifling to look like what it looks like. Have a great day, FC Steve
That is very interesting! I feel like I understand Glock's rifling now. I've always known that Glock used polygonal rifling but when I looked down a Glock barrel it never really looked polygonal. And I never really understood why until now. Thanks! BTW, have you heard that the gen5 Glocks have standard rifling?
Bob Hartman - If enough rounding is done with a polygon barrel, you get a round barrel. And calling their rifling polygonal after they have gotten through with adding the rounded lands and then rounding it all off is what caused all the consternation over past 30 years. I still cannot fathom why they just didn't call it Glock rifling as that would have been the most and best thing they could have done... Best to ya, FC
The glock polygonal rifling design can be used on Assault rifle barrels successfully and perhaps machine guns once barrel swaps are taken into account with testing on military guns showing excellent results. The advantages of polygonal rifling is not just limited to handgun barrels obviously as the recent test data shows. With some recent successful research and testing completed using polygonal rifling in Assault rifle barrels it turns out I was right and a substantial bullet velocity increase has been recorded compared to normal rifling with no loss in accuracy whatsoever and improved wear rates when used in assault rifle barrels with the rifle on Semi-automatic and Full-automatic. Many new idea's and research still to be done on barrel materials and manufacturing processes as well as rifling obviously. 😎🇦🇺👍
As a rifle shooter, the rifling I have gotten the best results from is 5R. It seems to be easier to clean and the odd number of lands/grooves seems to give better obturation. This way there are no lands/grooves directly across from each other. The "R" profile also seems to do less "damage" to the bullet and having no sharp edges, cleans more easily. I thought it was a myth that Glock's won't shoot lead bullets or more specifically, heavier lead bullets. Load some 147gr cast in a Glock 9mm and you get that wonderful "keyhole" effect we have all laughed at...unfortunately, it's very true.
AbitNutz - And you are in good company with the 5 groove - S & W also prefers that. And your ideas on bullet "damage" is what caused Marlin to go with Micro Groove barrels back in the day...As for the 147s keyholing - you and your friends are well aware that means the bullets are not being stabilized. There are several factors that cause that, of course. Now bear in mind that very very few military and police applications employ the 147s. The Glocks were first and foremost designed to be used for duty and service meaning 115-124 grain jacketed bullets inside of 50 yards (of course they do shoot well in trained hands at longer range - but if so, trot out the AUGs). If Glock factory barrels are shot with jacketed 147s, those may stabilize well enough, but only barely so...and with cast lead, the stability threshold may definitely not be reached as you have observed. Best to ya, FC
Dear friend, you have given us viewers such a nice perspective on polygonal rifling, science at its best, coming from one of the best in this trade. God bless you brother.
Walter Palmer - Funny how the way the other companies do their rifling is fully disclosed, but in 30 years, Glock has never gone into the particulars of their chamber and rifling designs or manufacture. Even after all the conjecture and supposition, Glock kept their silence (there were liability issues of course that could explain this - Kabooms). And the other companies that have copied the Glock concepts have not disclosed either - like they were industrial secrets or the like... Best Regards, FC
I always heard that Glocks had polygonal rifling but never knew it was a "modified" profile like that. My H&K pistol barrels are much simpler and smoother. The profile is theoretically a "hexagon" but really more like a "dodecagon" (12-sided polygon) with alternating long and short sides. I assumed all other "polygonal rifled" pistols were shaped this way. The H&K barrels seem to resist fouling very well and are very easy to clean, as they have no sharp corners to shelter fouling deposits like my lands-and-grooves barrels do.
elektro3000 - That's it in a nutshell - polygonal barrels have multiple flat sides in there twisting to left or right to make the rifling. Glock barrels may start out with a polygon mandrel (that the barrel will be pounded down upon), but by making those changes to each of the corners of the polygon, it ceases to be a polygon. Glock should call their rifling "hammer forged Glock rifling". That would have been more appropriate plus the branding would have been a marketing plus - and it should have been patented as well. As it is, many shooters who really don't know what polygonal rifling is, get all riled up and insist that Glocks have polygonal rifling just because the factory says so. Have a great day, FC
txwingnut62 - The reason you say that is Glock's fault... We've long since figured out the workings of Glocks and have a good selection of after market mods we can do or add. But Glock's purposeful vacuum of the last 30 years about their barrels = shooters having mystery and controversy right up to the present day. Best to ya, and thanks for posting comment... FC
the rifling looks on the glock picture ,just as a normal rifling with rounded lands , the same as a weihrauch 22/5.5 mm, airgun the hw 35 .hw80 etc beeman sold them also a luftgewehr in german
peteralexben - Always great to get comments from peteralexben... I'm surprised that we all aren't shooting fin stabilized sabot ammo out of smooth bores. Works for the world's main battle tank cannon to get first round hits out to 5 miles, why not? The best of those are licensed designs from Rheinmetall of West Germany - the 120mm gun. Best to ya, FC Steve
Projectiles that I've come across from a police issue 9mm showed no rifling, grooves or cutting of any type. Like a smooth bore. If you looked very close, you could make out that the projectile was slightly polygonal shaped. It would be very difficult to match it if used for bad reasons.
Look into the H&K 770/940 it's possibly the only true polygonal rifled barrel. apparently it looks like a kaleidoscope when you look down the barrel... or so I've heard. (ie reading up on forums about it).
Mr. LC- I don't believe they twist the mandrils after grinding the shape. They are made from carbide- presumably a more tough than brittle formulation, but still relatively brittle. Usually this kind of material is sintered into the final shape. I would expect it to be sintered (kinda like casting) then have the surface finish perfected by CNC grinding on a 4 axis lathe.
That's a detail that dosent really have any relevance to the point of what He's explaining. The process of how they actually make the mandrel isn't really important to understand what is being explained here.
I’m not bashing your video, I’m just saying your a little off. Polygonal rifling does not mean that the barrel is bored out in the shape of a polygon (hexagon as you showed.) it is all hills and valleys as opposed to lands and grooves. Basically it means that The rifling is “softer” and the rifling is forged. As a traditional barrel it has a barrel that is cut and is much more aggressive. You shouldn’t read what Glock says on their website. They said it gives enhanced accuracy. Polygonal rifling is known by everyone to be much less accurate than standard. It was invented by the Germans in the 40s to make rifle barrels quicker. Plus if you have hills… Then you must have valleys… You cannot have hills and not valleys The pros of polygonal rifling are 1. Cheaper to make 2. Quicker to make 3. Create higher gas pressure in short barrels 4 Allows for a more aggressive throat to barrel transitioning. However it has some really bad downsides 1. It is nowhere near as accurate 2. You need to make sure you do not use reloads, or any soft exterior bullet… Like pure lead… It will throw the pieces out the front of the barrel. 3. It can cause an extreme amount of fouling. More so than traditional rifle barrel. And fouling is much more dangerous when it comes to clogs because of the less space in the barrel itself. And biggest of all....... In certain guns especially polymer… It can cause a dangerous over pressure of gas (especially due to the increased Fouling)… This is the main theory of the cause of the Glock kaboom. This is why most Government agencies actually use aftermarket barrel with their blocks. And why the military told glock not to put a polygonal rifle barrel in their m17 submission.... even though they did anyway.
Pool Dead - No bashing - I own 4 Glocks so I'm not bashing either. Thanks for your comment...it took time to put that all out there. The reason for this video was for shooters to better understand what they are dealing with in all the discussions I see. The original concept of polygon barrels, the polygonal rifling was indeed in the shape of a denoted polygon twisting its way down the bore, with no hills and valleys just a polygon (valleys can be seen looking down the bore, but there are no hills). Yes, the Germans used polygonal rifling in their Mg42 machine guns and other guns. But polygonal rifling was used in some very early firearms and cannon. We both are talking about the same thing, but blame Glock for all the confusion. Yes, the current rifling is manufactured by hammer forging for the reasons you presented, but it is not polygonal rifling. Just because Glock says it is does not make it so when the historic polygon rifled barrels are considered. Glock barrels are not polygonal in the true sense. What they did was start with a polygonal mandrel (six or eight sided) and milled rounded depressed contours into all the junctions eliminating any sharp corners and severely reducing the flats that were on the polygons. Then the barrel was hammered onto this mandrel. And the depressed contours result in and account for the "hills and valleys" that people see. We are both seeing the same thing. Where we disagree is that true polygonal rifling does not have those. At what point does taking a square and altering it causes it to not be a square any longer? Once again, Glock is to blame for all this needless stuff. At one time, Glock actually said it was "their version of polygonal rifling". My point is that they should have called it "Glock rifling" and there would not be any confusion...all the Glock fans would be saying "Glock rifling" instead of perhaps jumping up and down and insisting that it is polygonal just because Glock said it was. "Glock rifling" would have added to the legend of "Glock Perfection" (a misnomer for sure as where is perfection when Gen 4s and Gen 5s come out? - Perfection is complete and finished by definition - but then again, Glock can change definitions to suit) One of the salient selling points of true polygonal rifling historically was that it fouled less (not more) than cut rifling as there are less and also less angled corners for fouling to accumulate. In Glock Kabooms, it is the oversized and relieved chambers and the cartridges unsupported case heads that are blowing. There's nothing new in this - we used to have lower order case blow kabooms with 45 acp 1911s when we throated the chambers too much trying to get that reliability in IPSC with major power ammo. Thanks for this thread, "Glock rifling" is what it is. Best to ya, FC Steve
Lucy Lauridsen - Thanks for posting, and have you seen Elvis Ammo's latest video on lead gathering? He makes runs in that pickup truck getting 1500 pounds of wheel weights at a time...thought about you when I saw that one...He should name that truck The Lead Sled... Best to ya, FC
Brandon Hodges - All Glock factory barrels are what Glock calls polygonal rifling - however, it is not true polygonal rifling - it is their altered version of polygonal. They really should have called it Glock rifling and patented it. It would have added to the mystique of Glock Perfection. Best to ya, FC Steve
Cmax Arms - Not at all. That should be a fine video coming out... RUclips is like the Borg said in Star Trek - "You will be assimilated...Your distinctiveness will be added to our own...Resistance if futile..!!" :) ;) :) FC
MadMetalManiac74 - The rifling twist is created by taking the mandrel with the rifling design incorporated on it, and twisting the mandrel to the desired twist rate. Then cold hammer forging the barrel around that mandrel. After removing the mandrel and then heat treatment to relieve the stresses, the barrel is ready for chambering and milling to the final pistol barrel...The type of rifling, whether polygon, modified polygon or cut rifling doesn't matter in this process - it can all be done. Best to ya, FC
FortuneCookie45LC so does the polygon twist along with the rifling? That's what I'm confused about. Or does the rifling spiral down a straight walled polygonal barrel? Don't really know how to say it. Basically what you've shown in the video is the very front profile where the rifling would be in conjunction to the barrel wall correct? What about the rest of the barrel. This is why I'm thinking the polygon twists with the rifling.
MadMetalManiac74 - Yes, the entire polygon is twisting down the barrel...done with hammer forging, the mandrel starts as a straight polygonal mandrel (like a hexagonal or octagon barrel). But then the entire mandrel is twisted to make the twisting rifling. Imagine one of those custom rifles with a fluted barrel, but the flutes are twisting down the outside of the barrel - That's the idea of the modified polygon twisted mandrel before the drilled barrel is slipped over it and hammered down onto the mandrel with the expensive hammering machines used. Best to ya, FC
hi fortune cookie, i am still confused to understand this rifling.i have 2 1911 pistols a 9mm goverment size, its internal barrel rifling does seem to looks like a polygonal riffling and it shoots ok.I am confused so much with the looks of my other pistol. it is a 45 cal sub compact size which is almost at the specs of an officer with the barrel of 3 1/8 " so with those short barrel i notice it has different riffling compare with my first one.its riffling looks a series of straight lines inside and had a round muzzle end .each lines extend from side by side in its shorted barrel.i dont know what do they call this type of riffling?as it looks simply just a straight line cut from one to another Do you think it is conventional riffling?by the way it is the ati titan.45..please note these series of lines is not on a spiral twist of which i pressume it simply is an ordinary riffling for a small barrel pistol.kindly guide me some educational thoughts for i notice i have so much difficulty hitting the target on this whenever i would take this to a firing range..the projectile is seem to be out and so inaccurate to hit a target..pls tell does it have some connections with its riffling?
Denciong Pogi - Your 1911 barrels are cut rifling - 1911s do not have polygonal rifling unless the barrel was custom made to have that. Even Glock barrels do not have true polygonal rifling as this video goes into that. Your short barrel has cut rifling - it only seems straight because the barrel is so short. If your regular bullets are not hitting the target sideways (note round balls do not have any sides), you have some kind of rifling. Rifling is either cut, or button rifled or hammer forged. Good shootin' to ya, FC Steve
Ante Pavelic - What a great idea...!! When I first heard myself recorded back in elementary school, I couldn't recognize my own voice. Have a great day, FC Steve
Andrew Peterman I wouldn’t. Get a storm lake barrel If I remember right, they can shoot hard cast lead (G20 10mm with buffalo bore HCL & storm lake barrel) I’ll have to double check.
*LOL this video aged well ..... hahahaha Gen 5: Glock modified it to be closer to actual regular rifling.* This is what happens when you're a plastics manufacturer before a gun manufacturer.
Looking at projectiles recovered from a Glock 19 I see flats and then the female rounded corners just as you have described. Great informational video.
Mossberg930 - Amazing thing is that male polygonal rifling types are being used - but not often encountered. Have a great day, FC
Like you've said before, Glock might as well call it Glock Rifling instead of polygonal rifling.
Dick Trickles - If you or I had been employed by Glock, we would have done just that = 1) patent that rifling process 2) create more distinctiveness to add to that of the Glock "safe action", Glock trigger etc. 3) more branding 4) eliminate confusion over the "polygon" since the company was not going to explain how they actually got their rifling to look like what it looks like. Have a great day, FC Steve
Great presentation, thanks for your TIME you spend on these videos it means a lot to us.
That is very interesting! I feel like I understand Glock's rifling now. I've always known that Glock used polygonal rifling but when I looked down a Glock barrel it never really looked polygonal. And I never really understood why until now. Thanks! BTW, have you heard that the gen5 Glocks have standard rifling?
Thanks for explaining the Cannon barrel polygonal concept, changed and used by Glock.
Bob Hartman - If enough rounding is done with a polygon barrel, you get a round barrel. And calling their rifling polygonal after they have gotten through with adding the rounded lands and then rounding it all off is what caused all the consternation over past 30 years. I still cannot fathom why they just didn't call it Glock rifling as that would have been the most and best thing they could have done... Best to ya, FC
The glock polygonal rifling design can be used on Assault rifle barrels successfully and perhaps machine guns once barrel swaps are taken into account with testing on military guns showing excellent results. The advantages of polygonal rifling is not just limited to handgun barrels obviously as the recent test data shows.
With some recent successful research and testing completed using polygonal rifling in Assault rifle barrels it turns out I was right and a substantial bullet velocity increase has been recorded compared to normal rifling with no loss in accuracy whatsoever and improved wear rates when used in assault rifle barrels with the rifle on Semi-automatic and Full-automatic.
Many new idea's and research still to be done on barrel materials and manufacturing processes as well as rifling obviously.
😎🇦🇺👍
It's been used on machine guns and rifles long before glock existed.
Another very informing video from you. Thank you sir!
64samsky - And you taking the time to post comment is much appreciated...Best Regards to ya..!! FC
As a rifle shooter, the rifling I have gotten the best results from is 5R. It seems to be easier to clean and the odd number of lands/grooves seems to give better obturation. This way there are no lands/grooves directly across from each other. The "R" profile also seems to do less "damage" to the bullet and having no sharp edges, cleans more easily.
I thought it was a myth that Glock's won't shoot lead bullets or more specifically, heavier lead bullets. Load some 147gr cast in a Glock 9mm and you get that wonderful "keyhole" effect we have all laughed at...unfortunately, it's very true.
AbitNutz - And you are in good company with the 5 groove - S & W also prefers that. And your ideas on bullet "damage" is what caused Marlin to go with Micro Groove barrels back in the day...As for the 147s keyholing - you and your friends are well aware that means the bullets are not being stabilized. There are several factors that cause that, of course. Now bear in mind that very very few military and police applications employ the 147s. The Glocks were first and foremost designed to be used for duty and service meaning 115-124 grain jacketed bullets inside of 50 yards (of course they do shoot well in trained hands at longer range - but if so, trot out the AUGs). If Glock factory barrels are shot with jacketed 147s, those may stabilize well enough, but only barely so...and with cast lead, the stability threshold may definitely not be reached as you have observed. Best to ya, FC
Dear friend, you have given us viewers such a nice perspective on polygonal rifling, science at its best, coming from one of the best in this trade. God bless you brother.
Great info as always. So much to think about , you make us think and learn , great job .thanks
Nick L - And the good news is that lifetimes can be devoted to all this stuff and there's no limit to it... Have a great day, FC
Very good practical explanation, thanks for the video.
Great explanation! especially the pretty flowers and butterflies!
These are great videos, FC. A late comer, I'm learning. Thanks.
Walter Palmer - Funny how the way the other companies do their rifling is fully disclosed, but in 30 years, Glock has never gone into the particulars of their chamber and rifling designs or manufacture. Even after all the conjecture and supposition, Glock kept their silence (there were liability issues of course that could explain this - Kabooms). And the other companies that have copied the Glock concepts have not disclosed either - like they were industrial secrets or the like... Best Regards, FC
I always heard that Glocks had polygonal rifling but never knew it was a "modified" profile like that. My H&K pistol barrels are much simpler and smoother. The profile is theoretically a "hexagon" but really more like a "dodecagon" (12-sided polygon) with alternating long and short sides. I assumed all other "polygonal rifled" pistols were shaped this way. The H&K barrels seem to resist fouling very well and are very easy to clean, as they have no sharp corners to shelter fouling deposits like my lands-and-grooves barrels do.
elektro3000 - That's it in a nutshell - polygonal barrels have multiple flat sides in there twisting to left or right to make the rifling. Glock barrels may start out with a polygon mandrel (that the barrel will be pounded down upon), but by making those changes to each of the corners of the polygon, it ceases to be a polygon. Glock should call their rifling "hammer forged Glock rifling". That would have been more appropriate plus the branding would have been a marketing plus - and it should have been patented as well. As it is, many shooters who really don't know what polygonal rifling is, get all riled up and insist that Glocks have polygonal rifling just because the factory says so. Have a great day, FC
Thank you , appreciated.
Very well explained and understood, thanks.
Any comments regarding increased risks of firing factory 40S&W rounds through Glock 22, 23 or 35 barrels would be greatly appreciated.
Best vid I've seen on this subject - thanks.
txwingnut62 - The reason you say that is Glock's fault... We've long since figured out the workings of Glocks and have a good selection of after market mods we can do or add. But Glock's purposeful vacuum of the last 30 years about their barrels = shooters having mystery and controversy right up to the present day. Best to ya, and thanks for posting comment... FC
hello Mr. cookie another great video! Would it be safe to reload with powder coat bullets to shoot through the Glock barrels thank you!
the rifling looks on the glock picture ,just as a normal rifling with rounded lands , the same as a weihrauch 22/5.5 mm, airgun the hw 35 .hw80 etc beeman sold them also a luftgewehr in german
peteralexben - Always great to get comments from peteralexben... I'm surprised that we all aren't shooting fin stabilized sabot ammo out of smooth bores. Works for the world's main battle tank cannon to get first round hits out to 5 miles, why not? The best of those are licensed designs from Rheinmetall of West Germany - the 120mm gun. Best to ya, FC Steve
Projectiles that I've come across from a police issue 9mm showed no rifling, grooves or cutting of any type. Like a smooth bore. If you looked very close, you could make out that the projectile was slightly polygonal shaped. It would be very difficult to match it if used for bad reasons.
tastiger91 - Thanks for posting your observations. The good news is that the forensics boys and girls are all over this... Best Regards FC
Interesting, thank you
minicoopertn - And thank you for taking the time to post...all YT posters need that... Best Regards, FC
Look into the H&K 770/940 it's possibly the only true polygonal rifled barrel. apparently it looks like a kaleidoscope when you look down the barrel... or so I've heard. (ie reading up on forums about it).
Mr. LC- I don't believe they twist the mandrils after grinding the shape. They are made from carbide- presumably a more tough than brittle formulation, but still relatively brittle. Usually this kind of material is sintered into the final shape. I would expect it to be sintered (kinda like casting) then have the surface finish perfected by CNC grinding on a 4 axis lathe.
That's a detail that dosent really have any relevance to the point of what He's explaining. The process of how they actually make the mandrel isn't really important to understand what is being explained here.
FC, I learned something new! Thanks
Bob Kopchik - Thanks for posting comment, much appreciated - Good day to the Bob Kopchik...and Best Regards, FC
Glock Rifling NO polygonal rifling.
Why do you sound like Bullwinkle?
colburn888 hey there Rock
Why do you act like a Troll?
I thought I was listening to the radio when the video started
Excellent video explanation.
this is clear as mud !!!!wish somebody could explain so to understand !!!~!~
The internet doesn't talk about how much more the glock barrel fouls. It talks about it leading from un-jacketed bullets. Get your shit straight!
Always, always enjoy and learn from your videos. Thanks
Hardy Birch - And thanks to you for posting comment...Have a great day, FC Steve
I’m not bashing your video, I’m just saying your a little off. Polygonal rifling does not mean that the barrel is bored out in the shape of a polygon (hexagon as you showed.) it is all hills and valleys as opposed to lands and grooves. Basically it means that The rifling is “softer” and the rifling is forged. As a traditional barrel it has a barrel that is cut and is much more aggressive.
You shouldn’t read what Glock says on their website. They said it gives enhanced accuracy. Polygonal rifling is known by everyone to be much less accurate than standard. It was invented by the Germans in the 40s to make rifle barrels quicker.
Plus if you have hills… Then you must have valleys… You cannot have hills and not valleys
The pros of polygonal rifling are 1. Cheaper to make
2. Quicker to make
3. Create higher gas pressure in short barrels
4 Allows for a more aggressive throat to barrel transitioning.
However it has some really bad downsides
1. It is nowhere near as accurate
2. You need to make sure you do not use reloads, or any soft exterior bullet… Like pure lead… It will throw the pieces out the front of the barrel.
3. It can cause an extreme amount of fouling. More so than traditional rifle barrel. And fouling is much more dangerous when it comes to clogs because of the less space in the barrel itself.
And biggest of all....... In certain guns especially polymer… It can cause a dangerous over pressure of gas (especially due to the increased Fouling)… This is the main theory of the cause of the Glock kaboom.
This is why most Government agencies actually use aftermarket barrel with their blocks. And why the military told glock not to put a polygonal rifle barrel in their m17 submission.... even though they did anyway.
Pool Dead - No bashing - I own 4 Glocks so I'm not bashing either. Thanks for your comment...it took time to put that all out there. The reason for this video was for shooters to better understand what they are dealing with in all the discussions I see. The original concept of polygon barrels, the polygonal rifling was indeed in the shape of a denoted polygon twisting its way down the bore, with no hills and valleys just a polygon (valleys can be seen looking down the bore, but there are no hills). Yes, the Germans used polygonal rifling in their Mg42 machine guns and other guns. But polygonal rifling was used in some very early firearms and cannon. We both are talking about the same thing, but blame Glock for all the confusion. Yes, the current rifling is manufactured by hammer forging for the reasons you presented, but it is not polygonal rifling. Just because Glock says it is does not make it so when the historic polygon rifled barrels are considered. Glock barrels are not polygonal in the true sense. What they did was start with a polygonal mandrel (six or eight sided) and milled rounded depressed contours into all the junctions eliminating any sharp corners and severely reducing the flats that were on the polygons. Then the barrel was hammered onto this mandrel. And the depressed contours result in and account for the "hills and valleys" that people see. We are both seeing the same thing. Where we disagree is that true polygonal rifling does not have those. At what point does taking a square and altering it causes it to not be a square any longer? Once again, Glock is to blame for all this needless stuff. At one time, Glock actually said it was "their version of polygonal rifling". My point is that they should have called it "Glock rifling" and there would not be any confusion...all the Glock fans would be saying "Glock rifling" instead of perhaps jumping up and down and insisting that it is polygonal just because Glock said it was. "Glock rifling" would have added to the legend of "Glock Perfection" (a misnomer for sure as where is perfection when Gen 4s and Gen 5s come out? - Perfection is complete and finished by definition - but then again, Glock can change definitions to suit) One of the salient selling points of true polygonal rifling historically was that it fouled less (not more) than cut rifling as there are less and also less angled corners for fouling to accumulate. In Glock Kabooms, it is the oversized and relieved chambers and the cartridges unsupported case heads that are blowing. There's nothing new in this - we used to have lower order case blow kabooms with 45 acp 1911s when we throated the chambers too much trying to get that reliability in IPSC with major power ammo. Thanks for this thread, "Glock rifling" is what it is. Best to ya, FC Steve
FortuneCookie45LC Awesome discussion by both parties
What about hard cast from wheel weights or Oregon trail cast. ?
The IWI Jericho or kriss sphinx are good examples of true polygonal rifling
Does it spin the bullet at the prescribed rate ? Yes. So.... why is this an issue? These are HANDGUNS ! Not precision tack drivers
Regardless it makes them extremely accurate
Great little video
Lucy Lauridsen - Thanks for posting, and have you seen Elvis Ammo's latest video on lead gathering? He makes runs in that pickup truck getting 1500 pounds of wheel weights at a time...thought about you when I saw that one...He should name that truck The Lead Sled... Best to ya, FC
wow you are a night owl good video my next pistol will probably be a Glock good to know
Exploring With Larry - Ha..!! I've done a lot of reloading at night also...Have a great day...and night... :) ;) :) FC
Great channel Sir ! Subbed
stype 977 - Thank you for your sub...it's a ticket to ride on Hot Lead Zone Express...Have a great time... FC
does a glock 19 gen 4 have poly rifling
Brandon Hodges - All Glock factory barrels are what Glock calls polygonal rifling - however, it is not true polygonal rifling - it is their altered version of polygonal. They really should have called it Glock rifling and patented it. It would have added to the mystique of Glock Perfection. Best to ya, FC Steve
Great video, I am working on a Polygonal project also........but not to your expert level.......
Cmax Arms - Not at all. That should be a fine video coming out... RUclips is like the Borg said in Star Trek - "You will be assimilated...Your distinctiveness will be added to our own...Resistance if futile..!!" :) ;) :) FC
This is my Glock 21 MmmKay!
So it is not real polygonal, Glock lied to us. Is Jericho the only polygonal pistol barrel?
You’re a genius... even if you sound like Bullwinkke...By the way... did Grandma run over you in the driveway?
holy fuck i was trying to figure out where his voice was from
Peaks n Valleys n Radius’s are the Words I Believe You Were Looking For FS Steve 😀
I'm still confused how they twist the rifling through a polygon and it works. the only thing that matters is where they start and end?
MadMetalManiac74 - The rifling twist is created by taking the mandrel with the rifling design incorporated on it, and twisting the mandrel to the desired twist rate. Then cold hammer forging the barrel around that mandrel. After removing the mandrel and then heat treatment to relieve the stresses, the barrel is ready for chambering and milling to the final pistol barrel...The type of rifling, whether polygon, modified polygon or cut rifling doesn't matter in this process - it can all be done. Best to ya, FC
FortuneCookie45LC so does the polygon twist along with the rifling? That's what I'm confused about. Or does the rifling spiral down a straight walled polygonal barrel? Don't really know how to say it. Basically what you've shown in the video is the very front profile where the rifling would be in conjunction to the barrel wall correct? What about the rest of the barrel. This is why I'm thinking the polygon twists with the rifling.
MadMetalManiac74 - Yes, the entire polygon is twisting down the barrel...done with hammer forging, the mandrel starts as a straight polygonal mandrel (like a hexagonal or octagon barrel). But then the entire mandrel is twisted to make the twisting rifling. Imagine one of those custom rifles with a fluted barrel, but the flutes are twisting down the outside of the barrel - That's the idea of the modified polygon twisted mandrel before the drilled barrel is slipped over it and hammered down onto the mandrel with the expensive hammering machines used. Best to ya, FC
FortuneCookie45LC ok I get it now 😉👍
MadMetalManiac74 - I know that this subject is somewhat twisted, takes a twisted mind to straighten it out...Have a great day, FC
hi fortune cookie, i am still confused to understand this rifling.i have 2 1911 pistols a 9mm goverment size, its internal barrel rifling does seem to looks like a polygonal riffling and it shoots ok.I am confused so much with the looks of my other pistol. it is a 45 cal sub compact size which is almost at the specs of an officer with the barrel of 3 1/8 " so with those short barrel i notice it has different riffling compare with my first one.its riffling looks a series of straight lines inside and had a round muzzle end .each lines extend from side by side in its shorted barrel.i dont know what do they call this type of riffling?as it looks simply just a straight line cut from one to another
Do you think it is conventional riffling?by the way it is the ati titan.45..please note these series of lines is not on a spiral twist of which i pressume it simply is an ordinary riffling for a small barrel pistol.kindly guide me some educational thoughts for i notice i have so much difficulty hitting the target on this whenever i would take this to a firing range..the projectile is seem to be out and so inaccurate to hit a target..pls tell does it have some connections with its riffling?
Denciong Pogi - Your 1911 barrels are cut rifling - 1911s do not have polygonal rifling unless the barrel was custom made to have that. Even Glock barrels do not have true polygonal rifling as this video goes into that. Your short barrel has cut rifling - it only seems straight because the barrel is so short. If your regular bullets are not hitting the target sideways (note round balls do not have any sides), you have some kind of rifling. Rifling is either cut, or button rifled or hammer forged. Good shootin' to ya, FC Steve
If you put on 1.25x it sounds like hes talking normal
Ante Pavelic - What a great idea...!! When I first heard myself recorded back in elementary school, I couldn't recognize my own voice. Have a great day, FC Steve
Can you shoot hard cast lead from these polygonal barrels
Andrew Peterman I wouldn’t. Get a storm lake barrel If I remember right, they can shoot hard cast lead (G20 10mm with buffalo bore HCL & storm lake barrel) I’ll have to double check.
lead is lead is lead, what your really asking is if you can shoot tin and lead alloy bullets (boats) through this
Bullets are round.
It's just glock copying H&k. H&I were first to use polymer and striker in handguns, first to use polygonal rifling in modern small arms.
Smartest guy on RUclips!
gman77gas - Wow!! Some might construe that as a huge put down on RUclips - Have a great day, Gary... Best to ya... FC Steve
Smartest man...then!
such a 300 dollar gun
and yet still considered the standard
*LOL this video aged well ..... hahahaha Gen 5: Glock modified it to be closer to actual regular rifling.*
This is what happens when you're a plastics manufacturer before a gun manufacturer.
Get to the point quicker next time...