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2.8 cm sPzB 41
2.8 cm ''schwere Panzerbüchse'' 41 (sPzB 41) or "Panzerbüchse 41" was a German anti-tank weapon working on the squeeze bore principle. Officially classified as a heavy anti-tank rifle (German: ''schwere Panzerbüchse''), it would be better described, and is widely referred to, as a light anti-tank gun.〔E.g. (US War Department Intelligence Bulletin, Nov. 1944 )〕
==Description==
Although the sPzB 41 was classified as a heavy anti-tank rifle, its construction was much more typical of an anti-tank gun. Like the latter, it had a recoil mechanism, carriage and shield. The only significant feature the weapon had in common with anti-tank rifles was a lack of elevation and traverse mechanisms—the light barrel could be easily manipulated manually.
The design was based on a tapering barrel, with the caliber reducing from 28 mm at the chamber end to only 20 mm at the muzzle. The projectile carried two external flanges; as it proceeded toward the muzzle, the flanges were squeezed down, decreasing the diameter with the result that pressure did not drop off as quickly and the projectile was propelled to a higher velocity. The barrel construction resulted in a very high muzzle velocity - up to 1,400 m/s. The bore was fitted with a muzzle brake. The horizontal sliding breech block was "quarter-automatic": it closed automatically once a shell was loaded. The gun was equipped with an open sight for distances up to 500m; a telescopic sight, (ZF 1х11 from the 3.7 cm Pak 36 anti-tank gun), could also be fitted.
The recoil system consisted of a hydraulic recoil buffer and spring-driven recuperator. The carriage was of the split trail type, with suspension. Wheels with rubber tires could be removed, making the gun significantly lower and therefore easier to conceal; the process took 30–40 seconds. The guns' construction allowed toolless dismantling to five pieces, the heaviest of which weighed 62 kg.
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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