I just purchased a new bullshead pt 1911 about a month ago. First range trip the hammer locked back after three rounds, all other functions worked yet. Took pistol apart, didn't find anything out of place. Put pistol back together and the hammer worked properly. Went to range today and hammer locked back on 12th round, same situation. Pistol is new and would rather not send it in but will if have to. Any suggestions on what to look for or should I just send it in.