Recently picked up a Beretta M9A1. I've had the gun out once and put 100 rounds through it. My question is that when I dry fire the gun in double action the hammer does not always drop 100% of the way. It stops short and I will have to pull the trigger again. This happens about 1 out of every 5 trigger pulls. Is this normal? I need to get the gun out more and run more rounds through it but I did not do it the day I brought it to the range.