Saab’s design was for a shoulder-fired recoilless rifle capable of firing 84 mm anti-tank ammunition. Recoilless rifles operate on the principle that equal but opposite forces counteract each other.

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The ’Davis Gun’ was not successful in putting big guns on biplanes. But the design evolved into a series of large caliber U.S. Army anti-tank weapons known as Recoilless Rifles mounted in ...