Common Design
The Nambu pistol series is a recoil operated, locked breech, semi-automatic pistol. The pistols are slender barreled with a single piece frame. The barrel is forged integrally with the receiver. The breech-lock was achieved by a propping system similar to the breech lock system used in the Glisenti Model 1910. As the barrel moved forward, the block would be lifted as it rode across the frame forcing the lug upward to lock into the bolt. The Nambu series is well balanced despite the main spring chamber protruding from the left side.
The Nambu pistol uses a low pressure 8 mm cartridge, which is considerably less powerful than comparable Western rounds like the .45 ACP, the 7.62x25mm Tokarev, the .455 Webley, and the 9x19mm Parabellum. The safety catch on the Type A requires both hands to operate; it was omitted entirely from the Type 14. The stock magazine springs on early models were too weak, which could result in jams. On the positive side, the Nambu was accurate, and the low recoil of the 8 mm round contributed to this accuracy.
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