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Chrome plating (less commonly ... in rifles are subject to very high temperatures—as the energy content of rifle propellants can exceed 3500 kJ/kg—and pressures ...
The Semmerling series of pistols included the LM1, LM2 (.380 ACP semi-automatic variant), LM3 and the XLM (.45 ACP semi-automatic variant) and LM4. [2] The only version available to the public was the LM4, which was first designed and manufactured in the US in the early 1980s and marketed at a price of US$645.
In place of the earlier chrome plating, blued finish was used on the bolt, trigger, and cocking piece starting in October 1944. The firing pin design was changed in January 1946. Sources: Houze 1993, p. 160 & Henshaw 1993, pp. 104–105. Approximately 383,597 [2] to 652,538 [3] Model 67s had been produced when production ceased in 1963. [8]
Black nickel plating was developed around 1905, and between the two wars, black chrome plating (first German patent 1929.GP 607, 420), which saw wider use only from the mid-1950s. [14] After the First World War, the first procedures for anodic oxidation and coloring of anodically oxidized aluminium were developed (1923, 1924.DRP. 413876).
41xx steel is a family of SAE steel grades, as specified by the Society of Automotive Engineers (SAE). Alloying elements include chromium and molybdenum, and as a result these materials are often informally referred to as chromoly steel (common variant stylings include chrome-moly, cro-moly, CrMo, CRMO, CR-MOLY, and similar).
New guns are typically available in blued finish options offered as the least-expensive finish, and this finish is also the least effective at providing rust resistance, relative to other finishes such as Parkerizing or hard chrome plating or nitriding processes like Tenifer.
The security series had options for: rifle sights or bead, a rifled bore and pistol grip rather than a butt. A riot version was made, with a stainless steel barrel while a marine version also had chrome plating on other parts. [21] [22] Winchester offered several combination gun lines. This took advantage of the take-down feature of the design ...
A .22 caliber model was also offered. Designed primarily for sale to federal, state, or local law enforcement agencies, the Police Positive was introduced into the firearms market by Colt's Manufacturing Company in 1905. [1] [2] [3]