Smith & Wesson K frame center pin $20.00 Part 2 on the exploded diagram. Used, excellent condition, center pin from a 19-4, K frame revolver. Will fit other models of K frame revolvers with barrels over 2.5 inches. Only 1 left in stock Smith & Wesson K frame center pin quantity Add to cart Category: Smith & Wesson Related products Smith & Wesson M&P 9mm .40/.357 Recoil Spring 19lb. $14.97 Smith & Wesson M&P 9mm .40/.357 Recoil Spring 16lb. $14.97