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Strange. My 10" barrel, despite the other problems has cycled just about everything. I've used 2400 powder, and I've used 110 grain bullets at subsonic velocities, and all cycle. This was with no muzzle device. In fact, it was cycling with a bit too much authority, so I added a heavy buffer. With the heavier buffer, it will still cycle sub loads with VVN110 about 90% of the time with no muzzle device, and 100% with a Noveske Pig.
EDIT: Ask TP555 what he drills his gas ports to. I didn't write it down, but off the top of my head, I think it's something like .169.
Regards,
-Dan
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