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Rust bluing was developed between hot and cold bluing processes, and was originally used by gunsmiths in the 19th century to blue firearms prior to the development of hot bluing processes. The process was to coat the gun parts in an acid solution, let the parts rust uniformly, then immerse the parts in boiling water to convert the red oxide Fe 2 O
Bluing or blueing: A passivation process in which steel is partially protected against rust, and is named after the blue-black appearance of the resulting protective finish. True gun bluing is an electrochemical conversion coating resulting from an oxidizing chemical reaction with iron on the surface selectively forming magnetite (Fe 3 O 4 ...
Typically, its use is usually restricted to receivers and non- stressed small parts. Although providing corrosion resistance, the colored surface layers are subject to wear and may also fade with time. Antique firearms for sale frequently note the specific percentage of the factory original case coloring remaining on the receiver and lockplates.
Firearms produce massive momentary forces upon firing a bullet. A typical 9mm projectile produces a maximum of 34,084 psi (2,350.0 bar) of pressure in the instant of firing. [6] The amount of pressure a firearm may endure for the first few milliseconds after the cartridge fires can be over 2,300 times more than the normal atmospheric pressure ...
The Official Police was machined of fine carbon steel, with blued or nickel-plated finishes, and was offered in 4, 5 and 6 inches (100, 130 and 150 mm) barrels.Built on Colt's .41 or "E" frame, it was manufactured in a variety of chamberings, including .22 LR, .32-20 (discontinued in 1942), .41 Long Colt (discontinued in 1938), and the most common and popular, the .38 Special.
Glock Ges.m.b.H., an Austrian firearms manufacturer, uses a black Parkerizing process as a topcoat to a Tenifer process to protect the slides of the pistols they manufacture. After applying the Tenifer process, a black Parkerized finish is applied and the slide is protected even if the Parkerized finish were to wear off.
The units manufactured before the World War II, being "Premium" weapons, received a heat treatment (not chemical) that left them with an intense blue bluing finish. [4] Revolvers produced before the war used a flanged screw and bolt to hold the barrel in place. When the screw is removed, the flange of the screw pushes up on the drum retaining bolt.
In keeping with prevalent economics in Germany at the time, factory finishes were limited to bluing or, rarely, nickel. The latter finish could be either matte or bright. No Ortgies pistol was produced with a chrome finish or, aside from one known salesman's sample, with factory engraving. [1] Production ceased in 1924.