One of the rarest machine guns in the pre-WarUnited States was this selective fire, air-cooled automatic rifle chambered for the powerful .308 caliber rounds, loaded using detachable 20 round magazines. The striker fired automatic rifle was one of the oldest and earliest light machine gun models, with a barrel screwed into the receiver, greatly limiting the ability to quickly replace barrels in the field, forcing the operator to fire carefully and more precisely than with stationary machine guns.
Automatic rifles found in the wastelands come with a fixed wooden buttstock and closed-type adjustable iron sights, consisting of a forward post and a rear leaf sight with 100 to 1,500 yard range graduations.
The trade off is that the powerful ammunition leads to plenty of sway. The spread is very high for an automatic weapon, the highest in the game, in fact, and requires choosing targets carefully and firing in short, controlled bursts. As an automatic weapon, it also loses durability rapidly and requires regular repairs. If fully repaired, it will serve for 996 rounds without breaking, just short of 50 magazines.
↑Joshua Sawyer on Formspring June 11, 2011: "Is the Automatic Rifle from the Dead Money add-on based off of the M1917 Browning machine gun? No, it's based off of the M1918 but with modifications to the grip and other parts."