The Model 1922 Bang rifle is a US semi-automatic rifle designed by the Danish arms designer Søren Hansen Bang.

It was gas operated, using a sliding muzzle cup system which was blown forward by the combustion gases while the bullet emerged from the barrel.

This ".256 Bang" rifle was a top candidate from 1925 to 1928 for US contracts ultimately won by the M1 Garand.

[1] The Bang rifle was ultimately unsuccessful in US government testing because of its mechanical complexity and susceptibility to gas fouling of the sliding muzzle cup.

The Bang blow-forward gas system, originally developed in 1903, inspired several other weapon developments: it was used in the unsuccessful French Puteaux APX machine gun of 1904, in its direct successor the controversial St. Étienne Mle 1907 machine-gun, and in the Gewehr 41, where it suffered the same shortcomings.