I just purchachased a russian captured K98 and I am having problems with the safety. When the bolt is cocked, the safety moves from left to right with out any effort (like a free fall). With the safety engaged, I pull the trigger and the cocking piece moves forward a little but does not fire however, after pulling the trigger and then moving the safety to the fire position (now there is pressure on the safety), the cocking piece falls and will discharge the round. Bad safety, cocking piece, etc?