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Pmags have difficulty engaging bolt stops on some rifles. Take your upper off, install an empty magazine, and see how much over lap there is between the mag's tab and the bolt catch.
Advntrjnky
Is the BCG not moving back far enough? If so what spring, buffer tube or buffer brand/type is being used.
If the BCG is moving back far enough then the problem you found in the gas system would be the first area to address. Keep up the good work and solve one problem at a time.
NRA Lifetime Member
Firearms and Diesel Trucks....the left's worst nightmare!
I repaired someone's rifle with the same problem. They built the rifle out of parts and the fixed buttstock was replaced with an Ace stock. The butt stock screw was too long for the new stock, so there was enough screw sticking out inside the receiver extension to stop the buffer from traveling far enough to the rear to allow the bolt to be engaged by the bolt stop. I replaced it with a shorter screw and the rifle functioned properly.
On another occasion, I was running a rifle class and I saw a working rifle start to malfunction. Initially I thought it was a gas problem and it turns out there was dirt in the vent hole on the upper buttstock screw. The buffer fit tight enough inside the receiver extension that pressure built up and would not allow the bolt to travel far enough to the rear. I cleaned the dirt out of the vent hole and it cured the problem.
Try using a magazine that you know will work in another rifle.
There are a lot of possibilities and without seeing the rifle it is hard to troubleshoot. Please give us an update when you find the problem.
Last edited by 7 RING; 12-19-12 at 17:49.
ok here are some pics gas block w crap that had come out of it(looks like rusty oil).... i checked the key to see if there were any leaks and there are none...the biffer is 3 1/4" the buffer spring is 9" i do NOT know the make of buffer, buffer spring or tube.....
other then that the lower is rock river
daniel defense lower parts kit
stainless steel trigger group
the upper was complete from M&A...dont know much about them...it is a crome lined 5.56 1:9
Photos did not come up, so you will have to fire again.
Repeat. Send it.
so the last pic is of me holding the charging handle back and pressing the bolt catch up...there is like .010-.015" clearance ...but thats with the handle not sure if when its running it will retract further ...also its a cheap cheap charging handle i plan on replacing it soon but just spent lots of money on ammo and a few more pmags because of this stupid government trying to take away our 2nd amendment rights
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