Have 10.5”, 11.5”, 12”, 14.5”, and 16” barrels. 12.5” is the shortest length that works correctly with a Surefire Mini can. 12.5” with mini is the same general OAL as 10.5” with regular SF Socom can, but with 2” more barrel.
Piston is a nonstarter.
With mid gas, no. This was for a...