Earlier I mentioned my Colt Defender in .45 ACP. After reading a few more responses to the OP's post, I wanted to write a bit more about my Defender.
It started out as a stainless Defender with a duck bill grip safety, a black long 3 hole trigger, a GI thumb safety, and some black wrap around rubber grips. Exactly like the OP's subject gun. The first day I took it to the woods, I shot a groundhog with it at about 30 yards. I thought Damn, I was expecting the gun to be a jammer but it just never did. After fitting a Wilson extended thumb safety, a short trigger, some wood stocks, having my gunsmith perform an action job, then shooting a couple hundred rounds of 230 grain ball and a few magazines of 230 grain Winchester Ranger HP's through it with not a single malfunction, I decided it would become my new duty gun when I moved to a plainclothes job within my department. But before I started carrying it every day, I thought I'd give it a few more upgrades. I delivered the Defender back to my gunsmith where he fit an upswept S&A grip safety, checkered the front strap, serrated the top of the slide, fit a polished steel feed ramp insert, fit a WC rounded main spring housing, then had the stainless parts refinished in Ion bond, and reanodized the frame black. He also welded up and refit the barrel. This Defender has continued to perform perfectly, and I shoot it as accurately as I do my 5 inch Colt Gunsite Pistol. I just have to slow down a bit. It's been with me from coast to coast, even inside the San Francisco Airport, and up the Seattle Space Needle. I refuse to go to NY, but if I did, it would be with me, hidden under my sweatshirt. It's IMHO one of the very best concealed carry pistols you can have. I hope OP that you buy that one and enjoy it as I have mine.