S&W Sigma40. Not my fave, but it's served me well & I've never had a single problem with it. It still gets some range time, but the XD40 has taken on full time duty.
Ruger Super Blackhawk. I shot so many lead reloads through that gun one day that it seized the cylinder. I brought it home and scrubbed it with solvent and a brass brush it barely touched the lead build up, I took the grips off tossed the gun in a pot of boiling water, cleaned and oiled the gun and it looked and shot like a new gun. 30+ years later, I still have the gun and it still shoots very well.