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AR .260 chews 'em up and spits 'em out...

 
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Old 06-27-2012, 06:01 PM
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AR .260 chews 'em up and spits 'em out...


My DPMS LR .260 has been having some issues. I need the AR experts and guru's to chime in here. Here's a list of the current issues.
1-Chewed-up and bent firing pin retaining clip. Less than 1000 rounds through the gun and this is the third retaining clip I've had to replace. Obviously somethings not right.

sideview

2-Chewed-up and broken gas rings on the bolt assembly itself. A large section is completely missing.

3-Unusual looking primers. They appear to be pierced. This occurs about 50% of the time. Sometimes they shoot out a tiny little ball of debris which gets ejected or lodged in the bolt carrier.

I can't help but think that maybe it's all firing pin related. Like possibly the firing pin is striking the primer too hard which bends the retaining clip allowing the primers to get pierced. I've repalced the pin already and nothing changed. Looks to be perfectly fine and normal too. Really, I'm totally clueless at this point. Please help and thanks...
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Old 06-27-2012, 06:12 PM
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Re: AR .260 chews 'em up and spits 'em out...

I looks to me as if you have a different problem. But here is a thread I started years ago about a real nightmare with a 260 DPMS. As far as I know it still will not shoot some factory ammo today. But the lighter offerings where the bullet leaves the barrel faster will release the bolt to open with minimal brass smear. It to did pierce some primers too.

Sorry this pics are long gone but here is a link for what it is worth.

DPMS 260 issues?

Jeff
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Old 06-27-2012, 09:35 PM
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Re: AR .260 chews 'em up and spits 'em out...

I haven't read the posts that Broz put in his response, so he may have helped.
But I gotta ask, have you contacted DPMS? My DPMS built .308 was having some problems. After a year of having the rifle and several hundred rounds they paid to have it shipped to them. They rebarreled it and fixed the other problem then sent it back to me with no charge.


Also, are these loads you put together yourself or factory. Big thing to consider.
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Last edited by Bravo 4; 06-27-2012 at 09:38 PM. Reason: Added info
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Old 06-27-2012, 10:57 PM
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Re: AR .260 chews 'em up and spits 'em out...

Your loads are to hot! That is a youngs manufacturing BCG they are know as one of the best in regard to maching specs. However youre gas key needs to be staked they are also known for not doing that.

If dpms will not fix it send it to Steve at ADCO and have him fix the gas port size your over gassed.
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Old 06-27-2012, 11:31 PM
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Re: AR .260 chews 'em up and spits 'em out...

Thanks for the advice thus far guys.

I've tried handloads and four different factory loads from four different manufacturers. That's why I never imagined that the problem could be the ammo. I'm not dismissing anyones advise at this point. I hope to find the culprit soon.

Also, the gun didn't come from DPMS directly so I can not call them. It's a semi custom build using their upper and lower. It has a Bartlien barrel, Jard adjustable trigger and Young Manufacturing bolt carrier group. The company that built the gun has been quite tough to get ahold of. Actually almost impossible.

Not familiar with Steve at ADCO. Where can I find his info?
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Old 06-28-2012, 08:34 AM
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Re: AR .260 chews 'em up and spits 'em out...

Adco Firearms LLC AR-15, M16, M4 Carbine Gear, Parts, Accessories.

Call and talk to Marvin, tell him the issues and see what he has to say. Call between 4-6pm. 419-882-8079

Thats realy a dangerous situation you have going on and something is not right.
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Old 06-28-2012, 02:45 PM
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Re: AR .260 chews 'em up and spits 'em out...

I didn't see where you mentioned what powder you were using, but I suspect that this coulod also be the result of using one that is delivering too much port pressure. Switching to a somewhat faster powder might help, though ARs aren't noted for having the same degree of port pressure problems that the M1/M14 family of Service Rifles did. Just a thought.
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