AMT .45 Backup without a doubt was the worst trigger I have encountered. My wife's boss wanted a new set of golf clubs and decided to sell his firearms to fund the purchase and so he sent three pistols home with her for me to look at. One was a Ruger P89, an AMT .45 Backup and a Colt King Cobra. I checked them for being loaded and then started examining them. The Ruger, well it was a typical Ruger P89, he wanted $450 for it. Then the Colt King Cobra which I was drooling over, he wanted $300. Lastly I picked up the AMT, he wanted $400 for it and tried to dry fire it. With great effort I finally got it to dry fire. I called for my wife and handed it to her and said try and dry fire it. She checked the chamber and then tried and tried and tried and finally said I can't is the safety on or something? Nope I replied and she tried again and with both hands and two fingers straining she got it to snap, handed it back to me and said I would be better off hitting a bad guy with my purse than trying to use this thing!
I told her to ask about the Colt to make sure he had his prices right and she hadn't confused them and he was sure $300 for the Colt, $450 for the Ruger and $400 for the AMT. I snapped the Colt up like a duck on a june bug!
Had another friend ask me to clean and test fire a P64 for him, that trigger was a beast but not near as bad as the AMT. I put a set of Wolfe springs in the P64 and tamed the trigger somewhat for him. But that gun even with the new springs just hurt to shot.