Originally Posted by NesikaChad
A new gun with only 600 rounds through it shouldn't be having gas ring or gas tube issues. Not unless your going "Blackwater" on your dog fields. Sustained rate of fire on these is about 12-15 rounds/minute.
I'd start looking elsewhere. Ensure your cam pin isn't binding at all. This could delay coming out of battery on extraction and lead to a lethargic action/cycle.
The carrier did fall when using the "table top" method, not alot but it did move.
I changed out the gas rings anyway and the bolt feels quite a bit tighter now.
Ammo seems to cycle more reliably now, but bolt still won't lock back on empty mag unless I pull it back by hand.
Tube and key clearance mic's out at .005" (key is .180 and tube is .175)
I ordered another tube from Bushmaster anyway, don't know when it will show up though. Plan to replace it and try again.
I also ordered a JP Enterprises "low mass buffer" weighs about 1/2 of what my buffer is. I'll try the buffer and maybe even a new gas block from JP if the new tube doesn't do the trick.
Cam pin seems very free, but if it's binding up inside the receiver that will probably be a gunsmith fix I am assuming? Am also assuming that if it needs another bolt and/or carrier, that will be a smith issue too due to headspace issues?
Thanks again Chad