Yes, rear sight is smooth, not grooved. What I observed on the gun is completely compliant with the Model 56 description except for the wrong stocks and the missing government stamp.

I also noted that the gun has a grooved trigger. I don't remember reading a specification for that but guessed it was correct. I still need to do a lot of work on smooth vs. grooved standard-width triggers. I never know which models have them and which models don't.

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David Wilson