Odd. I had the same problem last weekend. The hammer pin did not rotate completely around in the center fire position. When I tried to fire, it just left a small dent in the primer. I sprayed the selector with gun scrubber and break free. Now when I switch to the center fire position it clicks and the hammer pin faces the firing pin. I have not been to the range yet but dry fired spent cases and its putting a nice dent in the primers.