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A disassembled Mauser action showing a partially disassembled receiver and bolt. In firearms terminology and law, the firearm frame or receiver is the part of a firearm which integrates other components by providing housing for internal action components such as the hammer, bolt or breechblock, firing pin and extractor, and has threaded interfaces for externally attaching ("receiving ...
The first project undertaken by the company was an injection molded AR-15 rifle lower receiver. The company then moved to AR-10 style rifle lower receivers, and finally pistol receivers. [14] The name of the company refers to the injection molding process combined with the common designation of unfinished receivers as "80% receivers". [14]
New York City further bans metal 80% lower receivers that can be used to make a firearm. [58] Cross registration of handguns: Some counties limit who can register a handgun on their license, with some allowing cross registration of a handgun from any other licensee, to licensed family members only, to no handgun can be cross registered. State ...
IV Series 80; these models aimed at providing a more "mil-spec" pistol to be sold at a lower price than Colt's other 1911 models in order to compete with imported pistols from manufacturers such as Springfield Armory and Norinco. The 1991–2001 model used a large "M1991A1" roll mark engraved on the slide.
Under United States law, any company or gunsmith which in the course of its business manufactures firearms of finished frames and receivers, or modifies firearms for resale, must be licensed as a manufacturer of firearms. [50] These regulations do not apply to manufacturers of kit components and non-firearms like so-called "80% receivers".
The silver content of the coins was changed to 80% of silver and during the height of the silver famine was reduced down to as little as 40% silver. The rest of the coins composition varied, however coins minted by the Imperial mint used brass, copper and finally iron to fill the rest of the weight of the coin.
Consider a space ship traveling from Earth to the nearest star system: a distance d = 4 light years away, at a speed v = 0.8c (i.e., 80% of the speed of light). To make the numbers easy, the ship is assumed to attain full speed in a negligible time upon departure (even though it would actually take about 9 months accelerating at 1 g to get up ...
Einstein's 1911 argument that falling light is Doppler-shifted in a gravitational field. In the decade preceding Einstein's publication of the definitive version of his theory of general relativity, he anticipated several of the results of his final theory with heuristic arguments. One of these concerned the light in a gravitational field.