The breechblock is manufactured from an alloy steel forging which is heat treated to develop ultra-high strength (1030 MPa). The breechblock contains the electrical contact firing mechanism and circuitry needed to send the electrical signal to the firing mechanism probe, which comes in contact with the ammunition cartridge primer. The breech mechanism is a semi-automatic sliding wedge design. The gun tube has a thermal shroud to reduce the effects of bending and the bore is chrome plated.
Opposing threads on the breech and gun tube connect the two parts. The gun tube slides inside the breech and is then rotated 45°. The trunnions allow the cradle to rotate, controlled by elevation mechanism. The cradle connects to the tank turret through the mantlet which has a pair of trunnions supported by the turret and the elevation mechanism (a hydraulic actuator). The piston clamps to the breech via a series of bolts while supporting the gun tube at several locations.Ī dampened recoil spring between the cradle and piston absorbs the gun's recoil energy.
Supports the piston, gun tube, and breech, and allows them to recoil during firing.
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