I have a Sig 1911 Extreme and love it. Like any other 1911 they have a preference for mags. Mine likes the factory Checkmate hybrid supplied mags and all the Checkmate hybrid mags I purchased as extra duty mags. I have not tried any other mags because I have not had a reason to. It had a light, crisp, clean trigger right out of the box and has yet to skid a beat. The only thing I changed was replacing the factory night sights with the new Trijicon HD sights and replaced the fire control group with Wilson Combat Bullet Proof parts (not necessary at all). I gave $800 out the door for it new on the last day of the Fort Worth gunshow last year. Worth every penny...