Roughly in the area from Slidell to Mobile to Hattiesburg (inclusive.) I have been given a .45 ACP Colt Mark IV Series 80. It fired a couple of magazines perfectly, and then on the third the firing pin only dimpled the primer face on about 3 rounds.I know of only two gunsmiths locally. One of them had replaced the firing pin for the guy that gave it to me, so I don't trust him too much. I took it to another one to diagnose and fix it for me, and he took it out back, shot it, andgave it back saying he didn't know what the problem is, so I don't trust him either.Any recommendations or ideas would be appreciated. If all else fails I will send it back to Colt, but UPS requires overnight shipping which costs about $50. I have been told the reason UPS requirexs this is because too many weapons were disappearing if the packages were in the route for too long.