The first M66s had stainless triggers and hammers, but the alloy used was too soft, so S&W went to flash chromed carbon steel parts.
Transitions guns, left over parts -- all sorts of reasons.Interesting that there are those here who have a 66-2 that has a grooved trigger. I have a 66-2 that I bought brand new. Smooth trigger. Barrel is not pinned.
Might wanna tighten up the forward tang screw on the rear sight on that 2.5" 66, MarcoV.![]()