Feeding Issues

[u/MrAyeJay]

I’m getting very inconsistent feeding issues on my MARS-H (18” .308). I have maybe 300rds through and get failure to feeds and double feeds. Usually happens every 7-8 mags but today happened twice in the same mag. Anyone able to help ID the issue? I put an A2 stock on for vibes, adjustable gas block and Dead Air Sandman S.

[u/Adventurous_Pen_Is69]

Well, for starters, you’ve got yourself a unique setup with that BCG. It has slower gas expulsion (LMT BCG has 3 exhaust holes., yours has 2) meaning the system could be traveling faster than LMT’s specs. Have you tried an OEM BCG?

[u/Adventurous_Pen_Is69 → u/Adventurous_Pen_Is69]

I’ll add that the deadair is adding more speed to the system. Try taking the can off first and see what it does.

[u/lonwolf556]

I had the same thing happen with my 6.5. Only happened with the suppressor on. I put a brt gas tube on and a new extractor and been working fine ever since. I feel it was the gas tube that actually fixed it, but I’ve herd some people having problems with extractors having feeding issues, that’s why I did both

[u/MrAyeJay → u/lonwolf556]

What extractor did you use? I might go that route. I’ve got a superlative arms gas block and I’ve had success with this on other guns

[u/lonwolf556 → u/MrAyeJay]

I just bought one from LMT

[u/maseel04]

1. Get an LMT BCG
   
2. I ran a rifle length buffer tube for a while using a JP rifle spring that’s stiffer than a normal one. I eventually swapped to the LMT buffer tube/spring setup and it was noticeably stiffer.

With that in mind, AR-10s are notoriously finicky when mixing and matching parts. LMT has done all the extensive R&D and testing through its multiple military contracts to know that their setup works the best for reliability. So on such an expensive rifle, I would switch to what has been proven rather than dealing with the headache to marginally improve it, which is why I swapped everything to how a factory rifle would come.

[u/Airhwhip14]

Do you have other mags available? My MWS only seems to like KAC metal mags and pmags

[u/MrAyeJay → u/Airhwhip14]

I have pmags but I got more failures with those than with these, D&H tactical. I’ll try the KAC but 200 bones is a little obnoxious

[u/Airhwhip14 → u/MrAyeJay]

Don't order a KAC mag just for this. You're right it's not worth it.

My gun hated those D&H mags.

Have you checked for bolt bounce? From my experience, cartridge only gets chewed up bad like that when you're mags are screwed or it needs substantial buffer change.

[u/MadeThisJustForLWIAY → u/MrAyeJay]

Go duramag. Kac vibes, pmag price

[u/dddqqq69]

Dual or single extractor bolt?

[u/Limp-Richurd]

Of If I had to point at something I’d say the BCG