I’ve got a 15-20 year old Bushmaster XM-15 E2S 16” barrel, carry handle, iron sighted, old school carbine with this piston conversion installed, that is failing to function. Bolt doesn’t travel back far enough to strip the next round off the magazine. Have to manually cycle the action for every shot. A single shot repeating rifle. Very disappointed, clueless. Figured out the gas block was loose, Torqued it back down, took it back out to the range, fired a few rounds, 20-25 maybe, normal function, then same fte, ftf. Dead trigger or dry snap? As if minimal amount a gas was making it thru the barrel port. How do AR mechanics know exactly where the barrel gas port hole, is?
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