Sorry to kick start an old thread, but how’s everyone’s kits working out? I’m in the process of getting one, and never owned a sig, let alone their FCU - I’d plan on just getting a basic full size p320 simply for the kit - does anyone know if a .40 cal setup will work as well, and which sig to get if so? I’ve got several thousand rounds of .40 (gifted from a friend) that haven’t been touched for years, and figured I could put it to some use - also, anything to be cautious about when installing the FCU/Slide? Not a lot of info with personal experience online, and mainly people complaining about price tag, so I figured I’d ask here. TIA