I have a brand new Umberti .45. I was dry firing it with snap caps and I found that if I slightly depressed the trigger when I was cocking it, it would lock up. I know, don't depress the trigger. But I have fat fingers. Anyway, I went over the body and cylinder with Flitz, and that seemed to help. The thing is as dry as a bone, so I will try some lubrication (I have some great grease). to see if that helps. Any other suggestions? The trigger pull is great and I have to do a lot of dry fire to replicate this issue. I just do not want to draw, cock, and have it lock up on me. Thanks.