Something that I have recently started wondering about, trying the Ceiner conversion unit with an original Colt conversion magazine. If it would function, one should then have the slide lock feature as well as a magazine with the same size and feel as a standard 45 mag. I have tried many Ceiner conversion kits through the years, probably four to six were 1911s, and all worked very well. Still not a big fan of their customer service dept though!!!