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A Beta C-Mag undergoes field testing on an M4 carbine. The Beta C-Mag is a 100-round capacity drum magazine manufactured by the Beta Company. It was designed by Jim Sullivan and first patented in 1987 and has been adapted for use in numerous firearms firing the 5.56×45mm NATO, 7.62×51mm NATO, and 9×19mm Parabellum cartridges. [1]
Many drum-fed firearms can also load from conventional box magazines, such as the Soviet PPSh-41 submachine gun, RPK light machine gun, and the American Thompson submachine gun. The term "drum" is sometimes applied to a belt box for a belt-fed machine gun, though this is just a case that houses a length of ammunition belt, not a drum magazine.
Patent 5,187,324 was filed by John Ricco of CP Bullets in 1992 for an "improved 9mm cartridge casing" that he called the 9×23mm Super. He had the prototype brass casings made by Winchester Ammunition. They then modified the design slightly and filed it under patent 5,507,232 in 1995.
A drum magazine is a type of high-capacity magazine for firearms. [1] Cylindrical in shape (similar to a drum), drum magazines store rounds in a spiral around the center of the magazine, facing the direction of the barrel. Drum magazines are contrasted with more common box-type magazines, which have a lower capacity and store rounds flat. [1]
The lack of a projecting rim makes rimless cases feed very smoothly from box magazines, drum magazines, and belts. Rimless cases are not well suited to break-open and revolver actions, though in break-action firearms they can be used with appropriate modifications, such as a spring-loaded extractor/ejector or, in a revolver, a half or full moon ...
This greatly streamlined the reloading procedure and paved the way for semi- and full-automatic firearms. [ citation needed ] However, this big leap forward came at a price: it introduced an extra component into each round – the cartridge case – which had to be removed before the gun could be reloaded.
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The 9mm Winchester Magnum, which is also known as the 9×29mm, is a centerfire handgun cartridge developed by Winchester in the late 1970s. The cartridge was developed to duplicate the performance of the .357 S&W Magnum in an auto-pistol cartridge. [2] The first handgun which chambered the cartridge was the Wildey pistol.
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