Breech drive for a weapon

A drive operably connected to a breech, or to a breech carrier, or to the breech and to the breech carrier, of a weapon, wherein the breech is moveable in an axial direction with respect to a weapon barrel of the weapon, wherein the drive comprises

• (a) a motor;
• (b) a crank operably connected to be driven by the motor, wherein the crank is provided with a first groove formed in the crank;
• (c) a crank pin having at least one sliding means and a guide block fitted to the crank pin, wherein the crank pin is disposed in the first groove of the crank;
• (d) a first control cam, wherein the crank pin is positively guided in the first control cam, wherein
• the crank is rotated about a rotation axis by the motor, and
• the guide block is disposed to engage in a second groove formed in the breech carrier or in the breech, wherein the second groove is arranged transversely with respect to a firing direction of the weapon, so that
• movements of the breech in the firing direction, are predetermined by the first control cam and are transmitted to the breech via the crank pin and the breech carrier, or are transmitted directly to the breech, or are transmitted to the breech via the crank pin and the breech carrier and directly to the breech, and movements of the crank pin transversely with respect to the firing direction result in relative movement of the guide block of the crank pin with respect to the second groove formed in the breech carrier or in the breech.