I have a 1930's commercial that has been sleeved to 9mm. It shoots well, but when the bolt comes back, it doesn't always cock the hammer and the hammer catches on the little depression on the bottom of the bolt which effectively locks everything up. Solution is to cock the hammer with my thumb and the bolt goes back into battery with a new round. I have a new recoil spring. When I cycle the empty pistol by hand it ALWAY works right. The only thing that is different is that when shooting I think I am still depressing the trigger. By the way the trigger is VERY light. Do I need to replace something internally? Anyone have an idea?