Those Trooper Mk IIIs are every bit as strong as the L-frame S&Ws, and don't use the soft metal parts that make things squirrelly in the V-spring models. Simple, robust lockworks like these make an armorer's work very easy. I had a 6" that was a tackdriver, and a 4" that had close to 15K rounds through it when I sold it to a guy going to Lassen Community College as a project gun.