An automatically firing weapon, in particular for caseless ammunition, which has an improved hit probability so that a saving of ammunition is possible. For that purpose the weapon (10) is linearly movably guided in a housing (12) in the axial longitudinal direction of the weapon so that during a burst of firing, the weapon (10) moves back in the housing (12) unbraked and thus recoil-free in a return motion travel (x) which is defined and limited by a return motion damper (32).