joe from MO Posted October 24, 2019 Report Share Posted October 24, 2019 I just bought a DPMS LR-308 from someone who bought it years ago and did not shoot it. When I shot it the rifle failed to feed about 2 out of 3 rounds. The cases stuck about 2/3 's of the way into the chamber and the bolt would not close even with the forward assist. I tried new commercial and military grade ammo. DPMS metal mags, aftermarket metal mags, and MagPul P mags. Always the same result. The cartridges hang up entering the chamber and shave brass off the rear of the case from the 3 o'clock to 6 o'clock positions about half way down the case. I pulled the rifle down and it appears that the end of the barrel is a bit bigger diameter than the receiver resulting in a small lip or ridge where the barrel meets the receiver. That lip you can feel with your finger and appears to be causing the brass to shave and the cartridge to not feed fully into the chamber. I called DPMS and they would not help due to the age of the rifle. They said that the barrel would need to be replaced by one of their outside service centers. It appears to me that all that is needed is for the barrel to have a small camfer at the very end of the chamber where the cartridge enters. Just enough to smooth out the existing lip where the brass shaves. No different than camfering the end of a cartridge to accept a bullet during reloading. Has anyone else encountered this problem? Any suggestions as to how to fix this other than replacing the barrel? Any gunsmiths out there that can camfer this barrel? Thanks, Joe Quote Link to comment Share on other sites More sharing options...
98Z5V Posted October 24, 2019 Report Share Posted October 24, 2019 You talking about this? Which one is you, and your rifle? Quote Link to comment Share on other sites More sharing options...
98Z5V Posted October 24, 2019 Report Share Posted October 24, 2019 17 minutes ago, joe from MO said: I just bought a DPMS LR-308 from someone who bought it years ago and did not shoot it. What's super-important here Joe is this - is this a 100% full-on factory rifle that you bought, that DPMS built and shipped to the guy that you bought it from? Or did that guy change anything with it? What YOU have in your hands is the most important part. Pics of your rifle will help, because diagnosing gun malfunctions over the internet, based on what someone SAYS they have, based on what someone TOLD them they sold them... Just sucks. Because it's seldom ever right. Pics, man, pics. Get pictures of your rifle in this thread, then go hit the Intro Section and tell us about yourself. Info isn't free - there's skin in the game. Tell us about you, and you'll get more replies. Here's the Intro Section: https://forum.308ar.com/forum/22-introductions/ Quote Link to comment Share on other sites More sharing options...
dive4it Posted October 25, 2019 Report Share Posted October 25, 2019 Did you ever get this problem ironed out? I'm having the same issues with a recent build in 6.5 Creedmoor. Aero M5 upper. Quote Link to comment Share on other sites More sharing options...
joe from MO Posted December 11, 2019 Author Report Share Posted December 11, 2019 On 10/23/2019 at 11:33 PM, 98Z5V said: You talking about this? Which one is you, and your rifle? Quote Link to comment Share on other sites More sharing options...
joe from MO Posted December 11, 2019 Author Report Share Posted December 11, 2019 Thanks to the "specialist" for the photos and reply. The rifle is all stock, I know the guy I bought it from. The feed ramps like shown on the photos are OK. The problem is in the entrance to the chamber near where the head seats. There is a ridge or seam that protrudes and I think that is what is catching on the brass. It is along the entire circumference of the chamber about an 1/8" from the opening. Almost like where the barrel fits into another part. I do not have the tool to remove the barrel nut to see for sure. I took your advice and posted some info on the introduction page. And I will get some photos out when I get some time. To the person with the Creedmore, no I still haven't figured it out yet. I think it was a problem from the initial manufacturer of the barrel. It looks like the end of the barrel needs a bit of chamfering just like a case neck when you are seating a bullet. If I get no other suggestions I will break down and buy the tool, pull the barrell and chamfer just a tad off that ridge. thanks again, Joe Quote Link to comment Share on other sites More sharing options...
Cliff R Posted December 11, 2019 Report Share Posted December 11, 2019 (edited) I would invest in the tools to effectively remove the barrel. They are not all that expensive and good to have around especially if you get into building these weapons or want to make changes to the upper receivers. You don't have to be a gunsmith or have extensive machinist skills for basic operations like removing a barrel. You may have to invest in some good punches as some of the roll pins can be somewhat of a PITA to effectively remove without beating the chit out of things. The offshore/Chinese chit will fold, bend, mushroom out or break off in your work so spend a little more to get a good hardened set that aren't made out of whatever old car bumpers they melted down for raw materials last week! Once the barrel is out of the receiver you'll have much better access to the area(s) that need attention. I'd invest in a Dremel tool with a nice selection of accessories to get into the places that need a little attention. Let the marks on the cases guide your improvements, and do them sparingly, a little often goes a long ways when you are messing around with feed ramps and chambers. Worst case scenario if the problems persist a new barrel may be in order, but my bet is on you being able to correct the issues with the one you have now.......Cliff Edited December 11, 2019 by Cliff R Quote Link to comment Share on other sites More sharing options...
joe from MO Posted January 3, 2020 Author Report Share Posted January 3, 2020 Santa said to buy the tools. Does anybody know if a standard AR barrel wrench will fit a DPMS LAR-308? I think the barrel manufacturers should put a slight chamfer on the entrance to the chamber to guide the cartridge into the chamber. Especially when the end of the barrel's entrance to the chamber is smaller than the exit of the receiver. I have a good shop and will chuck the into my drill press and slowly cut a small chamfer. Will post results so maybe it helps others. Thanks to all who have tried to help me. Joe Quote Link to comment Share on other sites More sharing options...
98Z5V Posted January 3, 2020 Report Share Posted January 3, 2020 (edited) 24 minutes ago, joe from MO said: Does anybody know if a standard AR barrel wrench will fit a DPMS LAR-308? With what you've typed - those are two different guns. What do you have? DPMS is one gun, a "LAR-308" is a Rock River Arms gun - and the two platforms are pretty different. You just need to post a good pic of what's going on in YOUR GUN, here, man. Once you do that, we can figure it out. That hasn't happened yet. Edited January 3, 2020 by 98Z5V Quote Link to comment Share on other sites More sharing options...
joe from MO Posted January 12, 2020 Author Report Share Posted January 12, 2020 Sorry. Did a typo. The rifle is a DPMS LR-308. I took it to a local machinist who also has a gun shop and he saw what I saw and said the barrel needs a chamfer. The edge is so small I am not sure a photo would show it and I am an old guy who has never posted a photo on a forum. I'll go buy a AR wrench and see if it fits. thanks. Quote Link to comment Share on other sites More sharing options...
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