OK, my worst pistol was an Auto Ordnance 1911. It would not function right FTF, FTE, you name it. Changed ammo types. I put a new extractor in it. changed recoil springs a few times. Well, it started running good! I sold it, and bought a Sig1911.
Worst revolver was a Charter Arms Pitbull .40. Cylinder starting binding when firing. Sent it back to them. It was sent back to me supposedly fixed. Was a little better. Sent it back again. They finally sent me a new 1. Was better, but not good enough. So, I decided no C.A. for me. It went BYE-BYE! Bob
Same experience with with one of the early Auto Ordnance 1911s. Couldn't get through a single magazine w/o a failure of some sort or a part failing.
Another poor excuse for a firearm was a Walther TPH I had. First time out the DA trigger action broke ( a small pawl or hook on the hammer broke off). Got that fixed and then the SA started not working (sear broke). Gave up.