An automatic weapon (10), especially for caseless ammunition with the weapon (10) being guided so that it can move linearly in its longitudinal direction in a weapon housing (14), enabling the weapon (10) to recoil unrestrained over a defined recoil distance (P1, P2, . . . ) during a firing burst. A primary magazine (22) for a large number of powder charges (24) and a primary magazine (18) for a large number of projectiles (20) are attached to the weapon housing (14). The weapon (10) has a jointly moving magazine element (26) for a small number of powder charges (24), and a jointly moving magazine element (28) for a small number of projectiles (20) corresponding to the small number of powder charges (24).