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CETME
CETME is an acronym for ''Centro de Estudios Técnicos de Materiales Especiales'' (Center for Technical Studies of Special Materials), a Spanish government design and development establishment. While being involved in many projects CETME was mostly known for its small arms research and development. The CETME rifle is its most famous project and the CETME name is most often used to refer to this rifle.
CETME also designed the CETME C2 a 9mm advanced Sterling-like submachine gun, and the CETME Ameli (AMEtralladora LIgera) a light machine gun in 5.56×45mm NATO.
== CETME Rifle ==
The CETME rifle was designed primarily by the German engineer Ludwig Vorgrimler, who based his design on the experimental German StG 45(M) and the French-made AME 49. The StG45 used a roller-delayed blowback mechanism somewhat similar to the roller-locking system patented by Edward Stecke in the 1930s in Poland and used in the MG 42. The MG42 locking system actually locks completely and requires a short stroke barrel that travels backwards to unlock, compared to the StG45(M) system that never completely locks and does not require a moving barrel. The CETME design inherits the StG45(M)'s fixed-barrel. The first prototype rifles fired the same 7.92×33mm Kurz round as the StG45, and a variety of experimental 7.92 and 7.62mm cartridges were tested before settling on the 7.62×51mm CETME. This round was dimensionally identical to 7.62×51mm NATO, but with a lighter bullet and powder charge to reduce recoil, making fully automatic fire more controllable. Due to feedback from Heckler & Koch, the production rifle was chambered for the more powerful 7.62mm NATO. The Model B went on to be the foundation of the widely-deployed Heckler & Koch G3 battle rifle.
The CETME Model A began manufacture in Spain in 1957. The CETME series of battle rifles was manufactured in five models, the A, B, C, L, LC and LV models. The primary difference in the three first models is the absence of bipod and the lightweight C model, and the fact that the L, LC and LV models fire the smaller 5.56×45mm NATO cartridge.
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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