I bought a AA 1911 kit and had a problem too - the hammer was not cocking. The gun fired, ejected the old case and fed a new one, but the hammer was not cocked. I tried this on 2 different guns with the same result Before you do anything, call AA. I did, and they emailed me a pic of 2 different slides and asked, does yours look like the one with the big red line drawn through it, or does it look like photo #2- mine was the one with the red line. They said to send the conversion back so that they could swap parts, or I could do it myself. They sent me the part in a few days. If yours is like my old one, dry fire the gun and while holding the trigger trapped, pull the slide back and have someone push the disconnector with a small punch, you will hear it reset. If its like mine, the underneath area of the slide on the AA kit has a hump where it should be a smooth part- if you have the hump, the slide is not resetting the disconnector on the gun.
hope this helps,