Smith & Wesson N frame hammer block, blue $20.00 Part 78 on the exploded diagram. Used, excellent condition hammer block from a Model 57, N frame revolver. Will fit other models of N frame revolvers. In stock Smith & Wesson N frame hammer block, blue quantity Add to cart Category: Smith & Wesson Related products Smith & Wesson K / L / N Frame Standard Shooters Pack $29.97 S&W 39/439/3904 series XP magazine springs 3 pak $34.97