I only did it once!! Kept the fingernail and got a little smarter...
I was just so used to shooting rifles and have a tendency to stick my thumb up a bit when Iwrap my hand around the stock.I don't even put my thumb up anymore when I'm shooting long guns. It sure gets your attention and made me feel like a moron. I became a compleat moron the following week when I dry fired it. DUH....