VV1 Smith & Wesson K Frame Military & Police Bolt & Hammer Block fits Multiple N Frame Round Butt Factory OEM mainspring designed for

Factory OEM mainspring designed for Smith & Wesson K and N frame revolvers

These genuine S&W rosewood grips feature finger grooves that provide superior control and a natural pointing grip

The Model 581 features a heavy barrel and robust construction

Stainless steel construction for durability and corrosion resistance

VV1 Smith & Wesson K Frame Military & Police Bolt & Hammer Block fits Multiple N Frame Round Butt Factory OEM mainspring designed forVV1 Smith & Wesson K Frame Military & Police Bolt & Hammer Block NOS Fits Models: 10 thru 19, 64 thru 67 How to determine the model number of your Smith & Wesson Revolver. Swing out the cylinder , check behind the yoke on the frame for a MODEL NUMBER. Model numbers began in 1957 58. So if there is no model number then your revolver may be older than 1957 58. In this case we can possibly still find the part you need with the serial # . If this is the