The Winchester Model 1917 machine rifle, also known as the Burton Model 1918 or the Winchester-Burton, is an American machine rifle.
The Model 1917 was designed to shoot down enemy hot air balloons, and was also used as an observer's gun. Little documentation of this weapon survives other than the above. The weapon is slightly shorter and significantly lighter than the later Browning Automatic Rifle.
The Model 1917 fires using blowback from an open bolt. It uses two 20-round magazines fed into the weapon at 60° angles. One magazine feeds at a time instead of both feeding in rounds. The weapon has a bayonet lug which is considered unusual.
- The Model 1917 is considered America's first assault rifle.