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The Krummlauf (English: "curved barrel") is a bent barrel attachment for the Sturmgewehr 44 (StG 44) rifle developed by Germany in World War II. The curved barrel included a periscope sighting device for shooting around corners from a safe position.
It was produced in several variants: an "I" version for infantry use, a "P" version for use in tanks (to cover the dead areas in the close range around the tank and defend against assaulting infantry), versions with 30°, 45°, 60° and 90° bends, a version for the StG 44 and one for the MG 42. Only the 30° "I" version for the StG 44 was produced in many numbers.
The bent barrel attachments had very short lifespans—approximately 300 rounds for the 30° version, and 160 rounds for the 45° variant—as the barrel and bullets fired were put under great stress. Another problem besides the short life-span was that the bending caused the bullets to shatter and exit the barrel in multiple fragments, producing an unintended shotgun effect. As a result, weapons designers experimented with small vent holes drilled into the Krummlauf's barrel in order to reduce pressure and recoil, allowing the discharged bullets' built-up gases to be released to slow the bullet's velocity as it turned to exit the barrel. Nevertheless, the Krummlauf's lifespan remained the same. A triangular shield was also added to prevent venting gasses from clouding the mirror and optics. [1]
The 30° model was able to achieve a 35x35 cm grouping at 100m.
The Krummlauf in a Maschinenpistole Vorsatz (P) mount was developed as an alternative close defence weapon for tank destroyers. This mount was fitted to a roof hatch in many Panzer IV/70 (A) vehicles. The tank crew could then attach a StG 44 and use this as a close defence machine gun.
Experiments to adapt the Krummlauf to the PPSh-41 were conducted by the Soviet Union. [2]
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The evolution of German military rifles is a history of common and diverse paths followed by the separate German states, until the mid-19th century when Prussia emerged as the dominant state within Germany and the nation was unified. This article discusses rifled shoulder arms developed in or for the military of the states that later became Germany; it excludes firearms of the Austrian Empire, except where they were used substantially by German troops.
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