Have owned many over the years, but never any with a lock, and only one without a pinned barrel. And that one, had to go back.,
8 3/8" M629. The first year they stopped pinning the barrels IIRC, back in the early 80s. After a few hundred rnds, the barrel started to unscrew. Gun came back with barrel straight, and got sold.
Currently have 5 S&Ws, all pinned and recessed. Never had any trouble with any of them, and don't expect any. Won't buy the new ones, they aren't worth it, to me.