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Calzada Bayo CB-57
The Calzada Bayo CB-57 was a Spanish battle rifle prototype design chambered in the 7.62×51mm NATO round. Three different variants were designed in different calibers for the Spanish military, but they were never adopted and very few were built.
==Design==
The weapon and its earlier prototype rifles, the CB-51 and the CB-52, were derivatives of the StG-44 and was a contender to the CETME Modelo A, another rifle competing for the Spanish military contract after WWII. Cleverly, the CB rifles took the design of the Nazi German StG-44 and tweaked it for more modern use, as a lot of countries tried to expand on the advanced German weaponry after WWII. The primary difference between the CB rifles is the chambering but there were only a few minor cosmetic differences otherwise. The CB-57 also does not have a pistol grip like the StG and instead has a stock that serves as the handle, like an SKS carbine. The CB-57 also doesn't have a shroud over the barrel that also serves as a handguard. Otherwise, the two rifles are nearly identical. Unlike the StG, the CB rifles were only semi-automatic (like most battle rifles), but unlike most battle rifles, they utilized an obsolete yet proven design and boasted high-capacity magazines. The original CB rifles were slightly different from the StG-44, but by the time the CB-57 came around, it had practically the exact same bolt assembly as the StG-44.
The CB-57 was one of many prototypes devised for consideration for the Spanish army, however Spain eventually adopted the CETME rifle instead, leaving the CB-57 a relatively obscure, yet creative, firearm. Sadly, few designs of the StG-type have been produced since WWII, and the failure of the CB rifles did little to increase the popularity of similar reproduction rifles in modern calibers. Little is known about the CB rifles because the Spanish government hasn't released much information on the history of the CB-57 and its earlier prototypes, the CB-51 and CB-52.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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