I purchased an Advantage Arms .22 conversion kit and it arrived today. It cycles, feeds and ejects fine, the only problem is it does not push the hammer down enough to catch the sear. It's just a hair off. I noticed this when I assembled it and cycled it by hand. If I cycled it slowly, the hammer would ride the slide back, but if I cycled it fast, the momentum of the hammer would allow it to travel enough to catch. If I pull back the slide with the hammer cocked, the slide does not contact it. I thought that when shooting, the slide would cycle fast enough for the hammer to catch the sear. So I went to my brother's to cycle a few rounds through it. But only once did the hammer catch the sear out of around 100 rounds. Could my hammer be undersized? Is that why the kit cannot cock the hammer? I have a Para Ordnance GI Expert, which has a skeletonized commander hammer. It works perfectly with the original slide, not once has had a problem. I will try contacting Advantage Arms to see if they have encountered this problem before and if they have any recommendations.