Heres in depth info, Smith & Wesson 539 is a traditional double-action 9x19mm caliber pistol, part of S&W's '2nd Generation' semiauto line. All steel frame and slide version of the alloy framed Smith & Wesson 439 and stainless steel Smith & Wesson 639. Eight shot magazine, 4 inch barrel, blue or nickel finish. Adjustable rear sight with a short production run of a fixed-sight version. The fixed sight version is rare.
Specifications
(1981 - 1984)
Type: PistolCaliber(s): 9x19mmWeight: 2.25 lb (1.02 kg)Length: 7.438 in (189 mm)Barrel length(s): 4 in (102 mm)Capacity: 8-round MagazineFire Modes: Semi-Auto (SA/DA)