My son bought a brand new 1911 colt .45 acp pistol a couple years ago. It has always had a jamming problem. Since he hasn't shot it that much, he'd make excuses, "maybe it was the crappy ammo.." anyway, I've finally convinced him he has to get it fixed. He called colt, and to send it there it will cost $135 shipping overnight. That kind of sucks but its reality. Anyway, he said he thought about taking it too a gunsmith. I reminded him that I am a tool and die maker and anything a gunsmith can do, I can do just as well. I explained to him that I am betting that the entry into the barrel is probably out of tolerance on the small side pobably as little as a few tenths and we could lap it out pretty easy if we had the dimensions and tolerances of a .45 acp barrel. But I can't seem to find a drawing on the internet. Is there anyone on the forum that can direct me to a drawing with dimensions and tolerances of a .45 acp barrel? Particularly where the round is chambered? What makes me think this, is he finally bought some expensive hollow point rounds and loaded up the gun and chambered a round. Then he removed the magazine and went to draw back the slide to remove the chambered round and it was really hard to draw back. Any help would be appreciated.