High Quality Content by WIKIPEDIA articles! The Beta C-Mag is a 100-round capacity magazine designed by Jim Sullivan and adapted for use in numerous firearms firing the 5.56 x 45 mm NATO, 7.62 x 51 mm NATO, and 9 x 19 mm Parabellum cartridges. C-Mag is short for century magazine, referring to its hundred-round capacity. It has two drum units, each of which hold half of the cartridges inserted into the magazine. The latest version of the magazine features a transparent backing to allow the user to see the number of rounds remaining in the magazine. A C-Mag weighs about 2.1kg when loaded with 5.56 x 45 mm ammunition. One such magazine has been designed for the M16 rifle, in use by the US Military. The NATO Stock Number for the M16 version is 1005-01-363-6670. The magazine design, including drawings, is covered in detail in U.S. Patent 4,658,700.

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