FIELD: weapon using burning of liquid or gaseous propelling substance for throwing of projectile. SUBSTANCE: needle with axial channel is mounted in hole of wedge for movement into chamber to supply liquid propelling substance into internal closed tight volume of projectile holder located in weapon chamber and to suck it off under rarefaction. Weapon has barrel with chamber, breech and wedge breech block. Piston is put coaxially on needle. Wedge has feeding channel brought out into hole of wedge behind piston. Valve is placed into feeding channel. Breech block has profile surface to interact with valve. Pusher resting against butt of needle is positioned in wedge. Rotary lever set against pusher with one end is mounted in breech block. EFFECT: enhanced operational efficiency and safety of weapon. 2 dwg
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