The Marlin Model 1917 (7MG) is a WWI aircraft machine gun based on John Browning's Model 1895, redesigned by Carl Gustaf Swebilius for aircraft use. It features a straight-acting gas piston, a tilting bolt, and a unique synchronizer mount for firing through propellers. Early models had extraction issues resolved by adding weight to the gas piston. Its belts have distinct cartridge spacing, making them non-interchangeable with later designs.
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