.458 SOCOM, Radical Firearms MHR, Feeding issue and Overview
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- Опубликовано: 6 авг 2018
- Last Night I picked-up a Radical Firearms 16" MHR complete upper in 458 SOCOM. As soon as I got home I had issues with it. The rounds are not feeding properly. The projo is making it past the locking lugs but the shoulder and projo nose are impacting the top of the chamber and the 6 O'clock locking lug almost simultaneously. I am open to any suggestions! I am going to start with COAL, Magazine, and letting the guys at Arctic Ammo off the Palmer-Wasilla to take a look at it!
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Above are the links. 
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My 458 had the same issues. Not taking credit of this, I saw the video on RUclips. For Pmags, take a 1/2” drill bit, wrap it in 200 grit sand paper, sand the front part of the lips of the mag just slightly. It raises the angle of the round in the mag so it aligns into the chamber. Metal GI mags are easier. Bend the rear lips to an opening of .500”. Then bend front lips to an opening of .515”. Easier than sanding Pmags and works perfectly...
Most importantly, where are finding them for $1.20 each?
Same thought hell for 1.25 I would not reload anymore
Updates appreciated too, I purchased this and was told to make sure I had D&H mags. I purchased two mags for the socom and still having this same issue.
Saw your video and I was having the exact same issue you’re having. I bought a new “bolt only” from TROMIX for $110.00 and it completely fixed this issue without any modifications whatsoever to the feed ramp, barrel or mags. It’s works great, problem solved. Worth the money to fix the problem.
TRIBE LLC thank you for the info, I will look into that!
Michael Kaylor You’re welcome sir. I hope that is the only problem you’re having too. The bolt looks EXACTLY the same but I am not sure what the heck makes it work properly. I don’t see a single difference between them but the new bolt does work and the old bolt does not. Honestly I really don’t care as long as it feeds correctly now. I just wish I had knew of this before I spent a whole lot of money on my Upper.
I've built many of them. It's not a mag or ammo issue. The feeding ramp on the barrel needs to be widened and polished with a dremel with a barrel sander attached to it.
This is the right answer. After running underwood I found the case necking was too wide. Little dremel and polish at feeding ramp and solved
Had nothing but problems with my Radical 458 Socom upper. Tried a bunch of stuff. Finally dropped in a Tromix barrel and the gun is great.
Had the same upper, with the same issues. I ended up putting and extra power spring in the buffer tube and used the lancer 458 socom mags.also went online to tromix and bought the 458 socom follower for the mag. Also kind of buffed the feed ramps. It helped, but still had feed issues on the last shell. Would stovepipe everytime. Found that the flat nose hollow point ,wouldn’t cycle much at all but the ballistic tip from underwood ammo would a bit better. After all that, I Just couldn’t rely on the radical firearms upper to function properly.. was so excited to get it, then so disappointed when I did. So I sold it and bought a rock river arms beast upper. Have had not one single malfunction since.
if the mag doesnt present the round correctly when its in line to chamber itll cause issues, PMAGs are good for 556 but kinda suck when used for other rounds, i had similar issues with 300 blkout
Also steel feed lips for .458 socom... I don't remember why but Lancer has the half polymer steel feed lips that for the 458 that work
I'll check them out.
bought a bca 458 upper and just got down making 20rds. They chamber and eject fine one at a time. Problem is when i hand cycle with more than 1 in the mag, the 2nd round starts to come up to the chamber without the the bolt ejecting the first one out so a jam occurs. Im using lancer mags that have 458 printed on it but they are definitely 556 mags because of the etching on the mid section and the follower matching. I can fit 11 458 rds in this mag btw. I'll tinker with this upper tomorrow as this issue has already given me a headache
Risky Business so the first round is still on the bolt face when the second round attempts to feed?
It's the soft lead tip on the projectile. Provided that the feed ramp is singular and continuous from upper to lower receiver.
nelsonson1 I will double check that tonight.
I had the same problem with my 458 SOCOM upper I picked up off GunBroker. I modified the mags and that help a little but I could not load more than 3 rounds without it jamming and damaging the brass just like yours. I finally talked with a guy that told me about Tromix they make big bore rifles. I finally gave up and ordered a new barrel from them. I installed the barrel (has a great feed ramp) and then I could get 4 rounds to cycle most of the time. I was underwhelmed. I finally went to their site and was reading their FAQ page and there is told me most problems with feeding are because of the bolt. Well thay had given me a bolt with the new barrel but I put in in the spare parts drawer because I had purchased the entire Bolt Carrier from Brownels. I thought they were nuts but I tried changing the bolt (why not I already had it) and ALL my problems went away. It has never jammed since. I even tried some un modified mags I had and it worked with them as well and I can load 10 rounds with no problems. Their bolts are expensive and I do not have anything to do with them but if you still have not gotten it figured out give them a try. Here is a video I did about my experience with a little more information. gunstreamer.com/watch/458-socom-chambering-problems-2-0-fixed_yqrKWYoHDOHJJbg.html
Barn Dweller I literally just watched your video before this. Great suspenders my friend!
I see the bolts are sold out. 😑
Sounds like you need a better receiver and barrel. My son just built an upper. Faxon carrier, bolt, and barrel, Spikes upper. Shot two rounds the other night. Both would not fit out the ejection port He milled .100 " off of the top of the port and .030" off of the bottom. Functioned fine tonight.
I have read blogs about related issues.feeding lips on standard mags do not have enough opening.thats why you get dents in your brass.whats worse is it is potentially life and death issue.look for spec mags with milled off lips.Ar mags were never designed for single stack use although 50 beawolf don't seem to suffer from same problem
I did end up getting one with the relief cuts and it worked flawlessly.
I have the same 458 upper receiver I polished the feed ramps and took off the sharp edges. All so get your self some tromix magazines they will work alot better. You can reload that ammo shoot it first it my be one at a time but you can reload it. I have a video on my channel about my trouble.
bought a Radical barrel and bolt for 458 , had the same issue . sent barrel back to them they said they honed the chamber .then they sent me 2 mags . I noticed a enlarged cut in front of follower ( to clear round diameter ) also the lips of the mag have a more aggressive cut so the round moves upward sooner . did this to some older usgi mags now have no issues feeding .as for your brass , just shoot it will fire form to the chamber .
Thanks for the Fire forming advise, as for the mags, when I get out of this semester I plan to dremel a few mags to see how they work using the measurements I got from comparing the purchased mag with eh stock mags.
Use a dremel do the sigle feedramp mod all the way down into your upper as deep or deeper than m4 cuts and polish,mine runs anything now
lincoln jensen that is a bit more than I will take on with out a few practice runs! Thank you fort letting me know it actually does work though, I had been wondering.
@@michaelkaylor6770 yep look at the Faxon 458 and others ramps are single and L5 mags I load some cheap very flat nose pills with the radical bcg a heavy buffer and tubbs flat wire spring. Its not hard to do just take it slow I could do a quick vid on it and put it on my channel if it would help
I just bought one of these and have the same issue. I ordered a new bolt from tromix as well. Hopefully it helps. With as many of these having issues you would think radical arms would do a little better quality checks on their products before they send them out to market.
Jess Oldroyd I had to put it on the shelf to tend to other issues for a while, hope to look it over again later this spring!
Did the bolt help Jess?
I put the Tromix bolt in and and did a feed ramp polish and a BCG polish job and it definitely helped but I’m still having a few hiccups with the bolt missing rounds or double feeding. I decided to take it one step farther and bought the red springco buffer spring, new mag springs and an h3 buffer. I also bought the single stack Tromix mag followers for the lancer and gi mags. I also took a dremel tool to the front of the lancer mags and half mooned it down about a 1/4” so the neck of the round clears the mag and doesn’t hang up. I figure with some stiffer springs and maybe a little heavier buffer it might slow the BCG down a tad and solve some of the issues. If this doesn’t work then who’s knows what else could be done. I haven’t received all the new parts but I should have it all by Saturday so as soon as I can get all this stuff in I’ll let you know. Pretty ridiculous having to spend an extra $250 just to get this thing working right.
Jess Oldroyd keep us updated please!
I have deduced that with mine I was having the same issues with a hex mag and a metal generic .458 socom mag and It all has to do with the front part of the feeding lips being to narrow for proper feeding placement. You have to either bend on metal mags with pliers or sand down on hex mags
Ryan Perske that was the same conclusion I found after buying a Mag with lips and front wall relieved.
I just built an AR-15 in .458 SOCOM this week using Tromix barrel and bolt in an Anderson upper. It works great. Avoid Magpul PMAG’s.
I saw you on Hammer Hearts channel. I was already subbed but the Bell was not rung 👍
Shootin' with Uncle Dan thanks Uncle Dan, I am editing the video of our range day now, should be up in a few hours, thanks for the sub!
I have the 10.5" version, run subs and supers and have never had that issue.
Michael Lindquist it was a combination of hand-cycling and the P-mag. No issues during live fire, checkout the rest of the playlist for more info!
Any updates ?!?! I ordered a mag and still the same issue so I just ordered a new complete bolt from Tromix, so hopefully it will fix the issue I'm having. Will update soon.
Michael Crumpler I was told to purchase the D&H socom mags by radical and still didn’t solve the issue. Really interested to see if the bolt fixed this.
I'm facing the same issue and ordered the Tromix BCG. Didn't solve my problem. Ordered the mag fro Tromix as well. Still getting hung up while feeding.
Actually what fixed mine is I had to buy the tromix BCG and I smoothed the feed ramps a little better...and shoots great smh wish I would've known this prior lol if you want msg your email and I'll send you pics of how I did the feed ramps.
I have the Radical Firearms .458 SOCOM, 16" ........... I have an issue with ejecting the spent case.......... 10 rounds fired in single shot format..........and each time the fired case has become stuck in the chamber causing a hard lock on 7 of the test firings. I'm going to try a Tromix bolt or some other make of BCG.......I still want to keep the .458, cause I have tons invested in ammo.
I used the stock BCG, bolt, extractor/ejectors, and spring. I had no problem once I got correct magazine. Check out the last video in the play list!
Try Lancer mags they work better than magpul with the 458 Socom
brent3711 I stuck with the metal ones, but the consistent consensus is No Magpul, Yes Lancer or Stanag
The brass isn't ruined you can take a file and smooth it out. The most important thing is that you should bevel the front of the magazine so the neck of the brass doesn't hang up. Using polymer lipped magazines like pmags will also provide less friction since the round is in contact with both of them. Also those flat noses can jam on the locking lugs so if you want 100 percent reliability switch to a spitzer style.
I almost forgot, make sure they put the right feed ramp in. It should be machined down so there is just one big ramp in the middle.
So two replies here, First: I will have a new video coming out tonight, the 8th, about what has happened so far and the second is: Yes and No so the 6 O'clcock locking lug has been shaved down some the M-4 feed ramps are still visible. so that was not completely removed. I will try to get you guys a better look tonight!
pmags don't work well in the socom. The pressure that the 458 rounds put on the polymer feed lips makes them open up (the more 458 rounds you put in the mag). Try using metal mags or the lancer mags.
Full.Lead.Taco thank you, the metal STANAG with relief cuts has worked well so far!
Get rid of the Pmags they suck for .458 . Get some metal mags shape and polish feed lips to angle shell towards feed ramps. I've had the same issues with Pmags did this fix never a problem again.
Mike Rodent I finally found my supply of StanAgs so Whenever I get some time off from school I can cut and polish some mag lips!
You need a Tromix bolt. Get rid of the Radical bolt. It is not cut properly an also has the wrong extractor. Been there. Done that.
The brass denting issue was solved with the new magazine but I will keep an eye on the bolt and the case rims for signs, thank you for the insight.
have 1500 rds through my radical 458,no jamming with 405gr cast bullets
Sand and polish feed ramps.. issues solved! 😏
same problem
I have the same problem how did you fix it?
stewie garza I purchased a magazine with the feed lips clearance correct and after having the magazine drop a few times I am having a LGS switch all parts to a different lower receiver and I will update after that is complete!
did u try metal mags?
Not yet, as those were not in the house at the time. Thanks for the idea man!
,I have the same upper. I dint want to do anything to the unit do to the 1 year no question ask guarantee i got on it they of course could not find any problems. So i experiment with different types ammo i quickly found out the shortest ammo works best it is a ramp issued but further more the luck nut wount seat into battery becuz it cant chamber deep enougth for the lock nut to me contact i found that sbr hollow points low grains no more tha 300 work great but post manufacture ammo are usually hit or miss where 700 microns maybe the difference between you eating bear for dinner or the bear eating you
Using lancer mags that have metal feed lips and a specially made mag follower to accept single stacked rounds make it work flawlessly. Pmags, hex mags, troy mags will not work- don’t try it, save urself the headache and use lancer mags with metal feed lips. Single stack mag follower can be found on ebay: 458 magazine follower and they’re like $18
half moon trim on mag and order the bolt from tromix. you will have feeding issues with any other 458 bolt.
Bingo! I've got a pretty expensive build that was having the same issues. Half moon cut on front of mag, I also used a Dremel to taper back the front half of both feed lips allowing the round to point up towards the chamber a bit and bought a Tromix bolt. Runs like a top now.
What was causing this issue I’m in the market in purchasing this exact firearm aswell
It was the magazine not being relieved for the larger case radius. Issue was solved with a new magazine that has the forward wall cut down about 1/16 or so. If a magazine was included from Radical I suspect you will not see this issue, maybe hope is a better word.
Michael Kaylor if it’s not included where can I get one
@@51tinfante in Alaska I go through www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=2ahUKEwi8wePRtMjeAhUhGTQIHZytCEwQFjAAegQIGRAB&url=https%3A%2F%2Fwww.facebook.com%2Fpages%2Fcategory%2FGun-Store%2FArctic-Ammo-and-Reloading-Supplies-LLC-575065902526518%2F&usg=AOvVaw0TzW8RkfIv27IfSvKEVZ14 #arcticammo for all my Firearm relate stuff, just down right cool dudes and chicks working there with great selection and good prices! As for other companies, I can not say with certainty but a brand name is a brand name like lancer or other that are marked for 458.
****UPDATE folks****...my apologies for the delay BUT I purchased the Tromix BCG, purchased the special mags and everything...the only thing I didnt do, and what fixed the problem is that i polished and took some material off the feed ramps with a dremel, works like a dream now.
Michael Crumpler thanks for the update. Once I get done with the chicken coop and a generator repower I will be getting to the new lower with both the 5.56 and .458 upper!
I just purchased another BCG For my 458 socom The first time I fired it the casing spread out and jammed up into the barrel it was a pain to get out we had to use a ramrod to push out the casing and the BCG with this new BCG it grabs the round and ejects it but I was still getting scratches on the casing thanks for the update comment
I ground the bottom lug off of mine and deburred the locking lugs. I had this problem I ended up getting tired of it and bought a faxon barrel the faxon doesn't come with the bottom lug. My brother has a .50 beo upper or 12.7 has the same problem. After removing the bottom lug it feeds fine even with a stock pmag. I it may seem iffy removing a locking lug but again the faxon and tromix for that matter doesn't have the bottom lug.
Michael O'Brien interesting, I will look into the process, I just traded lowers so I am interested to see how it works with an Aero lower versus the “shady company” lower so had the upper on the begin with.
Took my radical arms rifle to the range today, couldn't get it into battery, using sharps rifle xpb bcg. Bolt kept jamming.
Did you ever end up resolving the issue? A couple weeks ago I picked up a Radical in .458 and am having the same exact issue. Not feeding properly and piching the brass.
With the magazine the has had the right clearances cut I have had no further issues!
You have to trim a little off the mag
Hey Mike did you figure the issue out? I live in Alaska and I'm having the same issue with this ammo in my Black Rain Ordinance upper.
The issue for me was the magazines and the fact that I was hand-cycling. Once I got a magazine with the right clearances, radiused lips and cut-down front wall, and it was functioning off the gas system it solved itself!
akjake7 Is your problem during live-fire?
@@michaelkaylor6770Yes.
akjake7 do you have a mag with the lips relieved and the front wall cut about an eighth?
@@michaelkaylor6770 I have a Lancer 458 polymer mag and a steel 458 mag that came with the black rain ordinance upper. Both have the relief cut in the front that appears to be ar least 1/8"+
Bland and polish feed ramps , like tromix does, also use lencer mags with 458followers
$1.20????
I am having the same problem, other than wasting my time with figuring out how to make a $1600 weapon work I am just going to go 7.62. This was a waste of my money and time. Absolutely ridiculous. Anyone who needs a .458 socom upper. Mine is for sale! It has a Fail Zero bolt.
Don’t give up. 458 SOCOM is a badass gun. Just work out a few bugs every gun is different. It’s kind of expected when building a gun yourself, especially when a gun is designed for 5.56 and you chamber it in another caliber. Anything you do out of mil-spec, you’ll have to do some fine tuning to get your gun to run the way you want it to. Worst comes to worst take it to a gun Smith and they will work out the bugs for you. Just don’t give up if you’ve already spent 1800 dollars what’s 200 dollars more to have the gun you want.
mags suck,brass will be fine after firing
Yeah i won't buy the radical, too many bad reviews... Most people have to sand down the m4 feed ramps left in there...
Now Ya Tell Me, Ha Ha Ha! I am thinking that I have to do something similar or I will return it to either the store or Radical and see what happens!
This is exactly what I had to do with my Radical Firearms 10.5 inch 458S upper. It added another $175 to the total cost of the weapon, making the bargain price savings not worth it.
Jason Craun I found a good mag, a big-bore relieved magazine did it for me and the website says they ship with a magazine now, though they do not what promoted them to start sending mags!
“It is a 5.56 follower though” you literally address half the problem. Quit being cheap and buy the right follower
I am going to try and slow-mo a bolt cycle to see if I get any bolt bounce or other oddity before spending the money. Thank is a possible solution though and in my wheel house as a fix. Thanks for the advise.
Michael Kaylor dude they’re like $10 shipped. If you really want it as a bear gun you don’t want it to jam. Is your life really worth saving $20. Don’t be dumb my friend good luck this season
Willlerd I have purchased a magazine with the appropriate trimmings and follower, it worked flawlessly! Also, after checking the Radical website, the uppers now ship with a magazine but since mine was sitting on the shelf for a bit it was before they started being part of the package. Thanks for the nudge!
Michael Kaylor good deal! I’m putting my Radical .458 Barrel on a Noveske upper I’m milling and put my bolt into my companies TiN BCG so she’ll be ready to go this weekend. But I need to get some followers for mags
Nice, and I'll bite... Who is "my companies" for the TiN BCG
Radical arms 458 upper is garbage
I put a new Aero lower on it, just waiting to get it back out once I can get some ammo, you know in 2042 probably.
I have the areo lower not happy I have the radical firearms upper with areo lower and it's garbage.
@@vincenthamilton4593 I suspect you have ensured the Aero lower does function with other uppers, 5.56, 6.5 Grendel or the 6.8 offerings? if that is he case have you found what the issue was for the Radical upper? Any help I can get with it is needed!
get kat upper you be smiling 😊