masonb55

I kind of suspected the gas system, but had no idea the buffer differences were so drastic. I'll hop on that deal. Thanks again man!

I know they're low quality pics, my camera is messed up, but this is what I can get now. And yes you are right, the buffer system is too short and light. would that cause a failure to extract though? I don't have an accurate way to measure the gas port in the barrel but a 1/16 (.625) bit can fit but an 5\64 (.781) barely doesn't so I'm guessing its .750 I also don't have a pic of the malfunction but when fired the bolt only travels about an inch back and gets jammed. It doesn't travel far enough to try to load another round on its own. The gun only cycled properly once in about 25 rounds I put through it today and that was randomly in the middle of shooting.

Thank you for the information this is exactly what I was looking for. I appreciate you posting this thread. My gas tube looks good but measures closer to 15 1/4 than 15 1/2 so that could be the problem. and when it comes to gas ports, I have now seen 2 people post on here with the same issue I'm having and it sounds like after having the gas port enlarged to .960 they're problem was fixed. I think I will just take it to a gun smith and see what he says. BTW I'm not on here looking to complain, just learn. thanks again

So what was cjnut talking about with his gas port then? did he over-gas the rifle?

thanks for the info, rookie mistake lol buffer tube inner depth is about 7" spring is 11 1/4" buffer is 2 1/2 " and weighs 37 oz or 104.5 g

Its an Aero M5 upper and lower but I bought the BCG and barrel(20")from CBC industries which I am almost positive is DPMS. The buffer tube and spring are not AR10 specific but it doesn't even have the chance to compress the spring as it gets caught right after it fires. The one round that did eject on its own cycled perfectly though. I just saw Cjnut's post from yesterday and it seems like the same issue. I realigned my gas block and will super lube the carrier before I try again tomorrow. If that doesn't work then maybe I should try enlarging my gas port like Cjnut? I might have figured out the problem. Gas port on he barrel is .936 and I bought a .750 gas block -__- every little thing counts

Its an Aero M5 upper and lower but I bought the BCG and barrel(20")from CBC industries which I am almost positive is DPMS. The buffer tube and spring are not AR10 specific but it doesn't even have the chance to compress the spring as it gets caught right after it fires. The one round that did eject on its own cycled perfectly though. I just saw Cjnut's post from yesterday and it seems like the same issue. I realigned my gas block and will super lube the carrier before I try again tomorrow. If that doesn't work then maybe I should try enlarging my gas port like Cjnut?

Having the same issue. I'm not sure the diameter of my gas port but I'll see if your solution can fix my problem!

I just finished my first AR10 build and took it to the range to test fire. I put about 25 rounds through it and only ONE was able to fully extract and eject. Every other round I fired would cycle the bold back about an inch and get jammed. It only ejected when I forced the charging handle back, then would have no issue chambering the next round. I'm not sure if it's a head space issue or a over/under gassed issue. I'm really not sure what the issue is. Any suggestions?