After reading this post, I checked my NMA's. Both of mine are Piettas. I have a stainless 44 and a blued 36. I was expecting to find the same thing on them as I've never really checked the safety notches. I was surprised to find that both of them lock up on the safety notch with no problems. Who'd have "thunk it"? The hammers go right in to the safety notches and lock the cylinders up tight. Maybe I got lucky? And as an afterthought, both of them were NIB and have never had any work done on them in regards to the safety notches and lock up.
If a pair of '51 Navies were good enough for Billy Hickok, then a single Navy on my right hip is good enough for me . . . besides . . . I'm probably only half as good as he was anyways. Hiram's Rangers Badge #63