(1) Biggest POS was a Ruger SP 101 .22lr. It would lock up in rapid double action fire. It went back to Ruger three times and three times came back NOT fixed. I traded it in for something else.
(2) Browning BDM, complete with Zamak parts and internal parts held in place with silicon RTV.
(3) Turkish made Regent R100, purchased on the strength of a "glowing' report by the American Rifleman. It taught me to NOT believe anything I read in that publication.