I just obtained this 3" Model 66-5 and though it doesn't have the dreaded lock it does have an MIN trigger and hammer. What I really like about this -5 are the sights. The fiber optic front sight is easy to pick up and the V notch rear makes sight acquisition fast and easy. The rifling looks shallower than my 3" 66-2 so I think it may be Smiths 5R rifling. Took it to the range and figured this rifling would shoot better with jacketed ammunition. To my surprise it was more accurate with lead bullets. The action is buttery smooth and the Hogue grips though ugly are very comfortable.