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On the night of December 2, 1943, 105 German Junkers Ju 88 bombers attacked the port of Bari, which was a key supply centre for Allied forces fighting their way up the Italian Peninsula. Over 20 Allied ships were sunk in the overcrowded harbour, including the U.S. Liberty ship John Harvey, which was carrying mustard gas; mustard gas was also reported to have been stacked on the quayside awaiting transport (the chemical agent was intended for retaliation if German forces had initiated chemical warfare.) The presence of the gas was highly classified and the U.S. had not informed the British military authorities in the city of its existence. This increased the number of fatalities, since British physicians—who had no idea that they were dealing with the effects of mustard gas—prescribed treatment proper for those suffering from exposure and immersion, which proved fatal in many cases. Because rescuers were unaware they were dealing with gas casualties, many additional casualties were caused among the rescuers, through contact with the contaminated skin and clothing of those more directly exposed to the gas.

Following the attack, the harbor was closed for operations for three weeks and it did not return to full capacity until February 1944.

Dissatisfied with the rapidly overheating fixed barrel of the m/21, Carl Gustaf began to design a new quick-detach mechanism for the barrel which mates the externally grooved chamber to a series of rotating flanges in the receiver operated by a locking lever. The barrel also received cooling fins along its entire length. These enhancements were incorporated into the fm/1935 prototype which was favorably evaluated during trials in 1935. The final version was the Kg m/37, adopted for service in 1937, which uses a smooth contour, unfinned barrel. Numerous m/21 guns were retrofitted with the screw-on receiver extension and quick-change barrel, and renamed the Kg m/21-37. The m/37 remained in service until being replaced by the FN MAG, but was still in second-line use until 1980. Carl Gustaf also developed a belt-fed prototype; however, it was never adopted.

The origin of this rifle can be traced back to the final years of World War II when Mauser engineers at the Light Weapon Development Group (Abteilung 37) at Oberndorf am Neckar designed the MKb Gerät 06 (Maschinenkarabiner Gerät 06 or "machine carbine device 06") prototype assault rifle chambered for the intermediate 7.92×33mm Kurz cartridge, first with the Gerät 06 model using a roller-locked short recoil mechanism originally adapted from the MG 42 machine gun but with a fixed barrel and conventional gas-actuated piston rod. It was realized that with careful attention to the mechanical ratios, the gas system could be omitted. The resultant weapon, the Gerät 06H (the "H" suffix is an abbreviation for halbverriegelt or "half-locked") was assigned the designation StG 45(M) (Sturmgewehr 45(M) or assault rifle) but was not produced in any significant numbers and the war ended before the first production rifles were completed.