My carry gun for the longest time was a Colt Gov't Model 70 45ACP. I carried that when I was plain clothes security, and drove an armor car.
Had very little problem concealing it under a suit or shirt that wasn't tucked in.
I got over 13,000 rounds through it. 95% of that was reloads. The biggest problem I had with it was/is the slide stop levelers. They would break at the barrel link, letting to slide and barrel come off the frame. Broke 4 of those. Lost the front sight 3 times. Needs a new barrel and bushing. The slide is loose. The whole gun needs a complete rebuild.