Hey guys! Ended up pulling the trigger on another can! Went with the aac tirant 45! Kudos to Michael at mk tactical for working with me. I ended up submitting my paper work via trust even though the efile server is down. (First time using a trust for nfa items) I'll let everyone know my experience in the next several monthes with this route! Anyway, the tirant comes with a m16x1 thread pitch and also ordered a .578x 28 to cover other barrels. If memory serves me correctly. The usp tactical is m16x1 lh pitch. I have some glock and 1911 hosts I can use, but I just want an excuse to add either the usp tactical or sig p220/p227. I wanted to try to get others experiences on these pistols. I have a fnx 9, and it's a nice pistol, but not nice enough for me to want a fnx 45 tactical. Happy 4th!!!