I had a customer bring in a Taurus PT145 semi-auto pistol. The customer said it would not fire, only would put a little dimple in the primer. I took the pistol to the range this morning to test fire. Put 3 rounds in the magazine, worked fine. I then put 5 rounds in the magazine and it miss fired on the 5th round. Did it again, same thing. So I put 6 rounds in the magazine, fired the first 5 rounds fine, miss fired on the 6th. The miss fired rounds have a small hit on the primer. The rounds that did fire have a normal looking hit on the primer but also a small bar like impression to one side of the primer. Any ideas????
The little bar mark on the primer is caused by the gun opening with the firing pin still partially in the primer, not really a problem, many guns do that. If it is excessive or causing wear on the firing pin or firing pin hole you will want to fix it. Are you SURE it only misfires on the last round out of the magazine??? If so you may want to look to make sure the magazine follower/slide stop/slide etc. aren’t dragging excessively and causing the slide to not close completely. That will cause a misfire. Keep us informed,
Reply:
I was thinking that the bar mark was caused by the firing pin hitting the round as it was being ejected, so thanks for confirming that. My thought process must be somewhat correct. Yes it’s the last round. I will check the items you talk about. I will reply with what I find and how I fix it.
Answer:
Problem fixed. A good cleaning of the complete gun took care of the problem. Before the cleaning with 20 test rounds I had 3-4 miss fires. It seemed to always be the last round in the magazine. After cleaning, 20 rounds, all fired fine, no miss fires at all. I also did a complete cleaning of the magazine.
