Have one of my 1911s fitted with Sarco slide. Amazingly enough, it worked perfectly. Be warned, if you need to adjust the sights you will need a 20-ton arbor press to move them! Trust me on this. Otherwise? Great slides! Also, the cheap no-name Sarco.45 mags worked great with no problems. Do not know about long-term reliability, but they fit and fed right out of the box in every gun, which is more than I can say for some big-name mags!