Manufactured from 1879 to 1887, the Model 320 revolving rifle is one of the rarest Smith & Wesson firearms manufactured produced with a total production of 977. These firearms were serialized from 1 to 977. The Model 320 was manufactured in three barrel lengths of 16, 18, and 20 inches with twenty being the rarest length, as only 224 were manufactured by Smith & Wesson. The 20 inch barrel has a blade front sight (non-factory) and two-leaf folding rear sight. The top of the barrel rib is marked with the two-line address/patent dates. The matching serial number appears on the butt, cylinder, barrel and barrel latch. Blue finish with casehardened trigger guard and hammer. The barrel is fitted with a checkered hard rubber red mottled forearm with the Smith & Wesson monogram on the underside. The grips are matching with Smith & Wesson monograms in a circle at the tops. The stock is smooth walnut with blue finished attaching iron and a checkered hard rubber buttplate with Smith & Wesson monogram.