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Bolt drag


ZeroTurnZed

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Ok, I have this DPMS AR-10 that fails to cycle occasionally, fails to eject a round, fails to load rounds from a full magazine, the bolt doesn't always close fully, when there is a round chambered you cannot eject the round by pulling the charging handle without a rubber hammer to tap the charging handle repeatedly. I don't think I forgot anything that it is or isn't doing. Someone at the range suggested that I have a headspace problem. I was shooting 7.62x51 and did a little research and found the headspace is different on the NATO round and the 308 so I tried some 308 and had the same issues. I pulled the BCG and dropped a 308 into the chamber and it went in fully and fell out on its own when I turned the barrel up. I did the same with the 7..62 and got the same result. Next I put the BCG back in and let the bolt close then pulled back on the charging handle and there was quite a bit of resistance at first then it released. I found when inspecting the BCG that the bolt fit very snugly in the carrier. As I remember with the M-16 the bolt moved easily and smoothly in the carrier. So, I'm thinking the bolt and the buffer spring are the two problems with this rifle. Have I reasoned this out sufficiently? So, do I replace the BCG and the buffer spring or do some polishing on the inside of the carrier to achieve a smoother fit and salvage that component?

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1 hour ago, ZeroTurnZed said:

Ok, I have this DPMS AR-10

I'm just gonna start right off with this, here.  The magical "DPMS AR-10" is a unicorn.  It doesn't exist.  It's either DPMS LR-308 pattern, OR it's Armalite AR-10 pattern.  But those two patterns don't cross paths.

Just tossing that out there right now, because nomenclature matters, when you're asking us to diagnose a .308AR gun-problem over the internet.  Details really do matter.

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On 9/23/2021 at 2:47 AM, 98Z5V said:

I'm just gonna start right off with this, here.  The magical "DPMS AR-10" is a unicorn.  It doesn't exist.  It's either DPMS LR-308 pattern, OR it's Armalite AR-10 pattern.  But those two patterns don't cross paths.

Just tossing that out there right now, because nomenclature matters, when you're asking us to diagnose a .308AR gun-problem over the internet.  Details really do matter.

 

On 9/23/2021 at 9:21 AM, jtallen83 said:

How many rounds through the gun? Pictures, lots of pictures will help here.

These ^^^^ plus:

 

factory gun or build? Parts list? Pictures of bolt face and lugs? How well lubed? Lots of possible culprits but no where near enough info.

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I agree with edgecrusher 100%
 

I also strongly suggest never hacking into the metal; for DPMS guns try different BCGs and buffer springs since some parts just work better together.

An adjustable gas block is also useful for tweaking.

It will be something simple.

 

Edited by Exxpugno
Brain-fart
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I have seen so many guys have issues like this only to ask and see their gun and find out the bolt and inside of upper is dry as the Sahara desert after a 1000 year drought is this you ? is so get yourself some Mobile one synthetic oil 30 or 40 wt and soak your BCG in it for a couple of weeks when you are not shooting stick it in there this oil adheres to the metal and your bcg will become slick and easy to clean main question is yours dry? it should be pretty wet like almost dripping until all the parts can marry up and be happy....

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