I was out zeroing my 300BLK AR with a 10" barrel and SilencerCo Omega can yesterday. When I was done, I went to clear the rifle, but I couldn't pull the bolt back. Ended up using my foot to get it open. The round was really dirty, as were the top two in the mag. I looked in the chamber and didn't see any burrs - had a similar problem on another rifle. I cleaned everything up and dropped in my dummy round to test. Ejected it just fine. Thinking the powder might be the issue or is the chamber too tight?
300BLK SBR with can got round stuck - cleaner powder?
- Thread starter Armymutt
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Enjoy the world of suppressors mounted on short barreled ARs.
Being overgassed you get lots of fouling blown back in to the BCG and chamber area.
Being short barreled you're going to find that your ammo choices are more limited than with a standard barrel. The gas port size and it's position becomes extremely critical, especially if you use subsonic ammo.
Call SilenserCo and get their thoughts on the problem first, you might have to modify the gas port or change your loads.
Being overgassed you get lots of fouling blown back in to the BCG and chamber area.
Being short barreled you're going to find that your ammo choices are more limited than with a standard barrel. The gas port size and it's position becomes extremely critical, especially if you use subsonic ammo.
Call SilenserCo and get their thoughts on the problem first, you might have to modify the gas port or change your loads.
luzyfuerza
Member
Or install an adjustable gas block.
Shoot your gun with the loads you like, and adjust the block to eliminate overgassing while maintaining reliability. Settings will vary between suppressed and bare operation.
I really like my SLR adjustable blocks.
Shoot your gun with the loads you like, and adjust the block to eliminate overgassing while maintaining reliability. Settings will vary between suppressed and bare operation.
I really like my SLR adjustable blocks.
I made the ammo. Runs fine in my 16" barrel. That rifle had the same issue initially - ended up having to have the chamber polished up a bit. I'll look into the gas block. Am I just needing to cut down on the amount coming down the tube? I don't want to screw up the cycling, which is just fine.
luzyfuerza
Member
OP, you're right...if your gun is indeed overgassed, then you just need to use the adjustable block to reduce the pressure in the gas tube.
Start with the adjustable block full open, and gradually close it down until your gun/ammo/silencer combination fails to lock back on an empty magazine or to cycle properly. Then open it up a click or two, and shoot a bunch of rounds to verify proper function. Record the number of clicks open, and you can use that setting for that load in the future. Repeat the process for different loads and gun configurations.
Start with the adjustable block full open, and gradually close it down until your gun/ammo/silencer combination fails to lock back on an empty magazine or to cycle properly. Then open it up a click or two, and shoot a bunch of rounds to verify proper function. Record the number of clicks open, and you can use that setting for that load in the future. Repeat the process for different loads and gun configurations.
bikemutt
Member
The idea is to find just the right amount of gas, I prefer to start from a closed block and work up. Starting with a very overgassed position may leave your rifle jammed up real good.
plodder
Member
I had similar issues with my 10.5" barrel .300 BLK. Turned out that my homemade brass was from 2 or more different lots & makers. The case neck wall thickness was marginally thicker on some vs. the others. The cases were jamming in the chamber at the neck interface zone but before achieving full battery position. It would jam so tight that I had to employ the GI jam clear method (pull on charging handle while slamming buttstock to ground with authority).
All my jamming problems ended when I neck turned every piece of brass that I had re-formed. Check the dimensions of your brass meticulously before looking for more exotic causes.
All my jamming problems ended when I neck turned every piece of brass that I had re-formed. Check the dimensions of your brass meticulously before looking for more exotic causes.
Another_Kelley
Member
^^^
List of good/bad brass for converting that the guys at 300blk talk have accumulated....
http://www.300blktalk.com/forum/viewtopic.php?f=141&t=88599
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