Got a cva squirrel gun and the rear sight seems to be too low. I can't get a good sight picture (too much front sight stickin up), raisin the rear sight sure ain't going to help. Only way to get the front bead nestled in, is to slide my head way back the stock in order to get more drop. Could I extend the pull by adding a piece onto the stock or what?? It's a shame cause it's a nice little rifle...Help!!! Bud