I recently bought a Ruger 22/45. I wanted to get familiar with it so I disassembled it and cleaned it. When I reassembled it, it wouldn't fire and it wouldn't come apart again. I thought I broke it. I was bummed.
After posting on here in a near panic state, I made my way to Mary's Guns. Why I chose them specifically, I'm not sure. I'm very glad I made the trip. The gentleman behind the counter knew exactly what I had done and how to remedy the situation. Turned out, when re-installing the bolt I didn't set the trigger pin in right.
He showed me exactly how to get it back apart when this happens and how to put it back together so that it's right. We talked for a while, I bought some magazines, and we shook hands as I left.
I took my Ruger to the range a little later and put two bricks of .22 into some paper BGs with no problems. I'd have to say, aside from the rather sharp learning curve, this is a great little plinker.