I do not have a USC or AAC stuff. I have several cans though and there is a lot to consider when getting one. One that I never took into account for instance was Rugged's shipping their pistol cans with a piston already and not willing to exchange them. They are nearly identical to SiCo pistons so no issue for me there. Another question to ask yourself is commonality. Do you plan to possibly use the can on a pistol of similar caliber? Any plans to get a USPT or HK45T then I would lean toward the 16x1LH. If you were to get an FNX45T than .578x28 would be recommended. Just some thoughts to consider, for me personally I do not like LH threads, but not enough to replace the barrels with other thread pitches.