Abstract: 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).

Abstract: A mechanical initiating system (10) for caseless ammunition including a weapon breech block and a powder body chamber adjoining the weapon breech block. A firing pin is axially displaceably arranged in a through hole (26) formed in the weapon breech block. A powder body, which can be initiated by the firing pin and having a priming device, is arranged in the powder body chamber. In order to achieve a reliable and simple sealing between the firing pin and the inside wall of the through hole, the weapon breech block has a grease reservoir which is open facing towards the through hole, and the firing pin is peripherally provided with at least one grease groove.