I’ve got an 11.3” BA barrel, and it eats any brass ammo, no problem. Port is ~.070 ish. Maybe a little smaller. I’ve actually choked it down more for dedicated suppressed use. Sionics RGP and Colt 11.5” are in the same ~.070 neighborhood. I suspect it’ll be fine with any decent ammo. A good friend just bought one of these G 11.5” Super Duty uppers, so we’ll see soon enough.
RLTW
“What’s New” button, but without GD: https://www.m4carbine.net/search.php...new&exclude=60 , courtesy of ST911.
Disclosure: I am affiliated PRN with a tactical training center, but I speak only for myself. I have no idea what we sell, other than CLP and training. I receive no income from sale of hard goods.
I have a 11.5" Duty Upper (nitrided stainless steel, 0.068" port) that I use with their Super42 spring & H2 buffer. Has functioned 100% with various factory .223 & 5.56 loads.
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