I Think It's Under-Gassed?
Good evening everybody,
I just put together my first stripped barrel rifle and it's failing all across the board.
It's short-stroking, failing to eject, failing to hold bolt, failing to return fully into battery and failing to cycle the bolt at all on weaker Russian ammo.
I miced the gas port at .062" and read that mil-spec is .063 or about.
It was freezing at the range today--30degF and I just brought the one rifle to function test. I would've tested swapping parts with my known 100% rifle if I'd brought the darn thing, too cold anyway.
None of my ammo worked: WCC M855, Fiocchi 55 gr. PSP, UMC 55 FMJ, 24 gr. of TAC under a 55 gr. FMJ, etc., etc.
I read the barrel descriptions from several suppliers like Daniel Defense, they open up their 16" carbine barrel's gas ports to .075"
Should I consider opening up the gas port to .075?