Physical Dimensions: 36.25.2246a; L. 19 in. (48.3 cm); L. of barrel 12 7/8 in. (32.7 cm); Cal. .65 in (16.5 mm); Wt. 3 lb. 0.9 oz. (1386.3 g); 36.25.2246b; L. 19 in. (48.3 cm); L. of barrel 12 13/16 in. (32.5 cm); Cal. .64 in (16.3 mm); Wt. 3 lb. 0.5 oz. (1375 g)