AR-15 Barrel Length & Twist Rate (Part II)
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- Опубликовано: 6 сен 2024
- Here we talk AR-15 Barrel Length & Twist Rate. Nate Murr, Inventor of the Gripstop, and I talk AR-15 short barrel vs longer barrel, twist rate, muzzle velocity, M855 62gr Green Tip and M193 55gr ammo and much more. Do you want a longer or shorter barrel on your AR-15 build? We hope we answered most of your questions on building an AR-15 and barrel length and twist rate. Leave a comment below. Thanks!
Barrel Lengths discussed: 10.5", 14.5", 16", 18" and 20"
Twist Rates Discussed: 1 in 7, 1 in 8, 1 in 9, 1 in 10 and 1 in 12
Ammo Discussed: M193 55gr Ball, M855 62gr Green Tip, SS109 77gr Sierra Match King
Check out Nate's Instagram:
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CaptainBerzFanPage
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Even today. 4years later. This is the absolute best explanation for twist rate and application.
It really isn't though
@@anthonygonzales6029 ok AZG's, where's your twist ratio/bullet grain video...??? i see you do have a few vids and a FEW subscribers
Nate needs his own channel! Fantastic info!
Nate worked at a local gun shop I used to frequent years ago, and after speaking with him the first time I knew that this guy was a no bullshit, tell it like it is kind of guy. It's great to actually see this guy to see this brilliant mind of his educate the masses through this social platform.
Nate's a really knowledgeable and helpful guy. He gave me advise on my first AR build back when he worked at Lanco. Years later at a class he recognized me and said hi and asked how the rifle was running. Cool dude. I eventually SBR'd that build into a 10.5" suppressed and love it. It almost the exact same length as a 16" w/ flash hider. Still shoots 1' to 2" groups at 100 but is much more maneuverable around my house.
so you practice shooting inside your house? lol just jokin
Very informative and professional. No nonsense, I love it. Hard to find people that can be this concise and know what their talking about. Thank you.
not to discredit what you said, but the 1/7 twist was chosen over 1/9 for NATO solely to stabilize the M856 tracer projectile due to the projectile's length. The much longer projectile of the M856 requires a much faster twist to keep stable so that precession is kept under control sufficiently for the projectiles trace signature to remain relative to the M855 projectiles out to max effective range. There is no need for anything faster than a 1/8 twist unless you are shooting tracers. Therefore, 1/9 and 1/8 are the most ideal and provide for lower chamber pressure and longer barrel life.
1:7 is good for those new heavy ass hunting/HD rounds
I’m glad you said it! Most people don’t know this.
At least it probably makes a decent precision rifle for 77 Sierra match king bullets.
100%
Very helpful, I really like your attitudes and presentation, professional but just talking to regular folks trying to learn.
Thank you! I have a PSA AR-15 1:7 13.5 but a pinned flasher for 14inch barrel and I was really digging deep for the right direction on this. Mostly because the price of ammo atm. Helped so much thanks.
For a precision AR, why not go with a 20" fluted DMR. Same weight as an 18" but you get that extra velocity. I know its 2" more but Marines in Fallujah did it no problem.
@ "the juice is not worth the squeeze."
Where is Nates channel. Dude is the google of shooting knowledge. Love listening to him
I stick with 1 in 7 twist rate and i follow the rule if you buy quality ammo (69 Grain Black Hills or 77 Grain SMK) you will have more consistent groupings. Good stuff Berz.
Damn, dude knows his shit. I learned a good bit and got my questions answered all off this one video.
Thanks for watching!
Best brief on barrel lengths and twist rate as it relates to shooting philosophy and ammunition that can be used with twist rates.
well this kinda helped me out on my spr build 18'' barrel with a 1/8 twist.....
50TNCSA Good setup!
same here with an A2 buffer tube.
Really helped!! After having trouble with 62g, backed off to PMC Bronze 55g and shot 7/8 inch groups!
I shoot a simple M&p with a1/9 barrel. The 69grain black hill and any name 55 grain will shoot excellent groups. 62 and 75 not so much. The gentleman new his stuff, most that do are not TV personalities, just gunmen.
A great channel is admitting you are not an expert in a given topic and consulting with others who are,.as a solution to informing subs. Wish other gun channels could learn this. Nice.
Wow, that's a lot of info, but it was very well explained and definitely helped! Thank you!
I wish 1 in 8" was way more popular. I really wanted to get one in 14.5" but ended up getting a smoking deal on a nitride 1 in 7 14.5" mid-length barrel. All I buy is 55 grain right now but plan on getting some reloading dies & will try out some 62 grainers.
Thanks for the twist rate explanation. Was planing to buy a 1/7 16" carbine barrel assemble but a 1/9 16" makes more sense, since 55gr and 62gr ammo is what I'd most commonly buy. Plus, the 1/9 16" carbine barrel assemble is $50 less.
Investing in an AR platform very soon (likely H&K) and appreciated this video....Bravo!
Good luck!
This was exactly the information I needed. Thank you.
First off, Thank you for doing video on AR barrel length and twist rate! I'm new, so I am learning. My AERO Precision 16" bbl 1/7 twist, I just need to do a lot work. I've been reloading for 25 years, and I have not seen so much confusion in one caliber/rifle just because of the different barrel twist: 1/7, 1/8, 1/9 and 1/12. I have Ruger AR 556 1/8 twist. It will be a lot of fun!
i like to take about 14 types of ammo and test at 50 and 100 yards. Some barrels will do nicely with cheap stuff others just like the expensive stuff. For 3 gun i can hit 300 and 400 yard shots on 10 inch mgm targets with hornandy vmax 53 gr 5.56 superformance, under 100 yards i use remington umc bulk i use a 1 in 9 16 inch barrel.
Definitely enjoying these video's with Nate in them. They are very informative. Keep them coming. Also a HUGE fan of the gripstop. Bought one the other day for my KMR and I will never go back to a vert grip.
I think a lot of people forget about the gas length that you are using and how it comes into play as well. What with the longer time between a carbine vs mid vs rifle length gas system will allow more pressure to build behind the projectile increasing muzzle velocity as well. I was searching for an 18'' Mid length gas system barrel with 1:8 twist so as to have a barrel with nearly 20'' velocity and the universal ability to shoot nearly any round. However, that barrel seems to be a unicorn, lol. I settled with a Chrome Lined 16'' Mid-Length 1:7 twist.
One question everyone seems to ask is whether or not having a higher twist rate actually causes inaccuracy on projectiles, and all of the research I have done says No. There are some conspiracies that say it over stabilizes lighter bullets, but I doubt that would be any real issue, unless you were shooting 600+ yards.
Outstanding video (Part I & II). Very informative, and educational towards the technical aspects. I wish more people did stuff like this instead of the same old same old. Thank you very much.
Thanks for clearing that up... i always wondered about those twist rates and how they affect bullet accuracy. Thumps up for sure.
Hey guys, thank you. You've really expanded my understanding. I'm super new to the AR 15 platform but this video has made huge difference in my quest.
👍🙏👍
Currently building a 10.5 ar pistol. This series is help out alot. Thanks
Also as civilians unless we are competing our legal engagement range is going to be 25ft to a couple yards so accuracy isn't too critical.
very informative, always wondered what was a good all around twist rate
Super video, Captain and thanks to you Nate for helping. Great information. Very concise delivery. Keep making videos, guys...we need you.
Great video. Really appreciate the straight answers and wide coverage of barrel length materials and twist rate with effects on different ammo weights. I've been looking fro this info for some time now. Thank you
I love your "make love AND war" shirt. I have a safe full of ARs in different barrel lengths and calibers and this and the previous video were very informative and I thank you for posting them!
Always like to listen to Nate; good show Berz! Thanks...
Paul Giamatti over here teaching twist rates
THANKS FOR MAKING THIS . IFO WAS THE BEST FOR NEWCOMERS TO THE GAME.
This was an awesome segment helped me make some good decisions on a new rifle build. Thank you
Great video Berz. Loving the series..
The diff is punching paper steel, or effective military hits.
I'm planning to build an AR similiar to the one I had in the Navy back in 1971-72. While I plan to use a 20 inch Barrel, I hope to find one with a 1:8 barrel twist.
Nice job! Very informative without all the Macho I know everything BS it's almost her the other links
Thanks for watching!
It was great listening to Nate I learned a lot thank you
WOW you got less facial expressions than Kristen Stewart ...I like it! no messing around.
Great video and love the info .
Kristen Stewart is the manliest woman I know. She'd look great with a mustache. But maybe that's just me.
His beard is good... So I trust what he has to say... lol
It's a proven fact that guys with beards are more tactical... I'm not joking
john plewa been growing mine out so people know off the back this guy knows a thing or two lol
John 89 still laughing
white feather ddgltal triger
Seems to me that the number of revolutions guided by the rifling would have an effect on stabilization beyond just the speed imposed by whatever twist. If you have a 1:8 twist on a 16” barrel, that bullet is stabilized through 2 full revolutions before it leaves the barrel. Now if you lengthen or shorten that barrel with the same 1:8 twist, how does that affect the stabilization of the bullet? A 1:12 twist in a 6” barrel is only going to go half a turn through the rifling before exiting the muzzle, whereas on a 20” m16 is would be just under 2 revolutions. Differences in muzzle velocity aside, isn’t this going to have an effect?
Best video to understand how it all works. Great information spot on. 👍
Great explanation backed by quality experience. Than k you!
How will a 55 grain round do in a 1/7 twist?
Excellent video.. I really learned a lot. Thanks
Awesome vid. I agree the 1:8 twist works great in the AR's I own with the 16,18,& 20" barrels. Thank guys
Awesome.
great video, explained well and clear very informative. just getting into AR15's so this helped alot thank you!
Really good info here. Well spoken, explained, and delivered too. Thank you.
I've got good accuracy with IMI 55gr in a 1 in 7 colt m4, chrome lind barrel out to 300 yards. Just plinking coffee cans. It was more accurate the the m855 62gr. 77gr OTM I'm sure would be better but its expensive.
Ok i have a 18SS wylde chamber AR with 1/7.So i'm suppose to shoot a Higher grain bullet like in the 77 gr range.?77 grain ammo is pretty high dollar ammo.If i wanted to shoot the cheaper 55 gr ammo i need to be looking at a barrel twist rate of 1/8or 1/9 or higher for it to be accurate?It just seems like the majority of uppers for sale at places like PSA,Spikes and others sell mostly 1/7 twist barreled uppers.?
Really? I mostly see 1/8 everywhere and I recommend it.
onebigkahuna69 that's just bc most of the market tries to imitate mil spec. The "Well this is what the military uses so it must be the best thing to use" mindset
I agree. I bought a 223 wylde 18inch upper in 1:7 twist cause no one sold a 1:8 twist upper at the time. Kind of works out though since that upper could be used for when I want to plink out to 500yrds and a 16 in upper in 1:8 used for
Great information in this video. It would be cool to see one on AK barrel lengths.
I have a 100% mill spec rifle complete with a 1:7 twist barrel. I have a good ammount of 62 grain M855(glad i bought a bunch before the dear leader banned it) but I'm loaded up on 55 grain xm193 ..I was a little concerned about this.. I'm not a competitive shooter so I think I should be ok.
this is good shit guys. keep it up. was on the fence about getting a 20". i think i'll go 18" instead.
I got a 1/9 20 inch and can’t wait to go coyote hunting with it. Do some long range shooting.
DAMN!!!Nate knows everything about guns holy shit!! I'm not crazy knowledgeable about firearms but I learn soooo much from your videos.I watched a bunch of them before I started my first AR build a few months ago and and it turned out great!Thanks for putting these out they are appreciated.Question @CaptinBerz.....what is the muzzle break on the gun you are holding?It's awesome
Will there be a part three? I like these informative videos keep it up
Very informative. Thanks!
Great videos guys, really very informative. Thanks for your time and efforts!
so 1/9 1/8 in 18 or 20 inch barrel is better for 55gr depending on brand ammo and thats what most available
Thanks that really helped
a slow twist like 1:10 and above, or even 1:9 sometimes, will not stabilize 75/77 grains and very low drag bullets of like 70 grains and above. a 1:7 will stabilize 55 gainers and the heavy stuff though; a 1:7 launching 40 gainers approaching 4000 fps will start to explode bullets mid flight from cetrifugal force.
thats cool to know ! thanks
so basically with twist rates error for more twist than less
I like the standard military 1/7. I have found that my Colt carbines and rifles will consistently shoot 55, 62 and 77 all day long. I even have a dwindling amount of old 55 grn soft point reloads that some times shoot almost as accurately as the 77 grn OTM but not as consistently. My 1/7 Colt barrels seem to make every load look good on paper.
what barrel lengths?
I shoot the standard civilian legal 16" carbine and 20" rifle.
Its at 200 yards that the 1/7 will cease to stabilize the 55 grain, which is exactly what the 62 grain M855 is meant for. At 200 yards the 55 grain through a 1/7 will start to spread out to 9" on paper, where as the 62 grain will do about a 4.5" spread.
1/7 = 100% stabilization of 62 grain and heavier loads out to any effective range of the 5.56.
1/9 = 100% stabilization of 55 grain or lower out to any effective range of the 5.56.
Thats why most truly civilian AR's like the successful Smith & Wesson M&P or DPMS are 1/9 because most civilian shooters or cops shoot the 55 grain because it is usually cheaper and more common.
ok thank you for that knowledge, Ive only shot 55gr pmc out to a max of like maybe 120 yds (iron sights) and its done extremely well for me (ammo is cheap thats why i get that brand). I have a colt le6940 with a 1/7 16" barrel and am looking into longer distances since I just purchased an ACOG. Thank you!! Just one more question though, any specific brand that works for you???? Ive heard some guys say federal 62 grain doesnt do well in their rifles but PMC 62gr green tip does well
Your Colt M4 6940 and ACOG are the perfect combo. I have the same set up as well. Technically the 6940s floating barrel is a little more accurate than the standard M4 6920. At 100 yards I can't tell the difference. Its after around 200 yards that the accuracy of the floating barrel kicks in. It will consistently hold slightly tighter groups by an average of maybe 0.5" or so. Your gun with an ACOG and 77 OTM or 69 grain match ammo is a very impressive combination. You will be amazed at the difference in accuracy of OTM and match ammo over standard loads. I have achieved sub 1" groups at 100 yards with the 77gr OTM with a regular average of 1.5" at 100 yards.
Compare for your self the difference between 55 and 62 grain bullets. The 1/7 will reciprocate with the 62 grain much nicer. But this isn't my opinion, rather it is one of the reasons why the military switched to this format with the M16A2 in the first place.
As for PMC over Federal, your gun will tell you which load it prefers. Plus thats some of the fun in shooting, is to buy different brands of ammo and see which one the gun shoots best. Once you find what it likes then try to stock up on that load.
Use 55 grain for plinking out to 100 yards or shooting from the hip. Use the 62 grain for more serious shooting and for bulk stock up ammo. And use the OTM and match grade for accuracy shooting from the bench. But the 62 grain is what you should have the most of.
1/7 barrel are meant for anything over 72gr. M855 is intended for a 1/9 twist out of a 20" . 1/7 is meant for tracer rounds and other longer projectiles such as >72 gr. It over stabilizes rounds under 72gr so much that it will have 1) Less velocity then intended 2) will not YAW inside a body. You will have more of ice pick wound instead of the intended yawing effect for 5.56. I'd personally stock up on 77gr otm for carbines in 1/7 twist.
Great video. I didn't catch the twist rate info for a 10.5 barrel. 55 gr .223. I heard recently that the shorter barrel warrants as much twist as possible to maintain velocity... but I don't claim to know, just seeking info before I order a 10.5 pistol upper to complete my build.
Great information you guys
Great video thanks for posting
great info.
thanks for your service!
Great video series, very helpful. More like this please.
Good Clear Info. Very well done guys. Thanks.
Great talk on barrel lengths & twist rates...thanks. Bdsr
What's the difference in weight between a 10.5 and 16 inch barrel? I want to get my wife and daughter into AR-15 shooting but the size and weight of the 16 inch barrel is intimidating for them. I figure a 10.5 inch barrel with an ultra light sight, like a Trijicon RMR, might be manageable.
Wow you have answered many questions thank Bro
mate dealers over here are telling me 1/7 for all around bullets is the way the industry is going over your way ??
Thank you for explaining it all!
very helpful thanks guys!
hey guys loved your videos, just quick question 7.5 vs 10.5 barrel for strictly CQB only. What would you recommend?
Great video, very informative and helped me a lot. If you haven't already, go check out part 1, which is also very helpful.
I noticed with the Sig Sauer's DMR 716 AR 10 platform 308, Sig went with a 1/10 twist and a 16" barrel which he didn't discuss much about a 16" barrel or 1/10 twist. Why do you think Sig went with those specs for their DMR?
That was very in depth. Great job.
Very good basic information in Part I & 2.
Great video, answered a couple questions I had. Thank you!!!
Will I Achieve Higher Velocities in A 20in Barrel With a 1:12 Twist vs. Using a 1:7 Twist Barrel With 55 Grain M193 Ammo ? 😮
EXCELLENT AND INFORMATIVE VIDEO. THANKS GUYS.
Dam he is good
Hmmmm....... I know this but still great info men........
Cool, thanks
Really great video -- lots of information presented. Word of advice to the guy who did most of the talking -- speak slower! There were many edits; do you have a PDF text file of the full version of this presentation? Thanks
Great info, but nobody in the civilian market is clearing buildings. It is a tool. Period. The length barrel is all about it's intended purpose, which you kind of mention, but that is why you build more than one upper. 24" barrel to shoot steel out to 500 yards. 16" for everything else. 18" or 20" for those who can only build one.
Tom Kaus 24" barrel is a waste
Great info. Ive seen my 16" 1in7 twist do ok with the 62gr xm855, but much better with 77gr. Match king,To be expected with much higher B.C. . for hunting in my state min 6mm. I prefer .30 cal for hunting big game, and a reflex S.G.12ga slug for dangerous game. Only my expiriance. What do I enjoy shooting the best for just range shooting/ plinking? My AR.
Thank you
You guys Rock! This was awesome, you really answered my questions! Keep up the great work!
Loved these videos. Love the history. Can't find info on, "super squirrel snake eater," though. Help!
What about melonite barrells vs chrome?
melonite nitride coatings done properly actually penetrate past the surface level of the metal... so effectively if the treatment is done properly and to a high quality level.. it can be better than chrome lining..
That's Carl's opinion. One thing you can take away as a fact: melonite treatment costs less than chrome lining.
It's simple... If you have a machine gun, you want chrome lining. Anything other than that, nitride or a similar process.
Great info on both videos thanks
Great vid. Lots of info. Thanks for posting it