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One attempt to solve the problem used zinc shell cases that burned up when fired. A mechanism that was strong enough to handle the stresses of moving the large round was too heavy to operate quickly enough to fire rapidly. Testing of the gun in 1929 showed that a problem existed with feeding the weapon to maintain a reasonable rate of fire. Bofors' first test gun was a re-barreled Nordenfelt version of the Finspång gun, to which was added a semi-automatic loading mechanism. The company produced a gun that was a smaller version of a 57 mm (6-pounder) semi-automatic gun, developed as an anti- torpedo boat weapon in the late 19th century by Finspång. The navy approached Bofors about the development of a more capable replacement, and Bofors signed a contract in late 1928. In 1922, the Swedish Navy purchased a number of 2-pounder Pom-Poms from Vickers as anti-aircraft guns.
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The L/70 is still being produced and sold today (since March 2005 by BAE Systems AB) and has since its conception been transformed into a multi-purpose weapon with programmable ammunition, such as the "L/70B" light armoured vehicle variant used on the Swedish CV90 and Korean K21 infantry fighting vehicles. The L/70 design never achieved the same popularity and historical status as the original L/60 model but has still seen great export and popularity to this day, having been adopted by around 40 different nations and even being accepted as NATO-standard in November 1953. In spite of being a separate development, although based on the same core function and looking visually similar (comparable to the AK-47 vs the AK-74), the Bofors 40 mm L/70 gun is also widely known simply as "the Bofors" or the "Bofors 40 mm gun". In the post-war era, the original design was not suitable for action against jet-powered aircraft, so Bofors introduced a new model with significantly more power - the Bofors 40 mm Automatic Gun L/70. A small number of the weapons remain in service today, and saw action as late as the Gulf War. It was one of the most popular medium-weight anti-aircraft systems during World War II, used by the majority of the western Allies, and some Axis powers such as Nazi Germany and Hungary. The Bofors 40 mm gun (formally the Bofors 40 mm Automatic Gun L/60), often referred to simply as the Bofors gun, is an anti-aircraft autocannon, designed in the 1930s by the Swedish arms manufacturer AB Bofors.
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Gun Carriage Factory Jabalpur(1960-present)Ĥ0 mm L/60–70 (actual length varies from 56 to 70 calibers, based on model) Saudi Arabian-led intervention in Yemen.