| 摘要 |
This cartridge includes a tubular casing with a firing pin member fixed within the casing intermediate its ends. A frangible projectile is frictionally and sealingly retained in the front compartment of the casing. A piston is located in the rear compartment and consists of a transverse wall exposed at the rear end of the casing, and of a forwardly-extending sleeve slidable within the rear compartment. A primer cap is located within the piston sleeve and has a transverse deformable wall abutting against a boss rearwardly projecting from the firing pin member. The latter includes passages communicating the rear and front compartments. When a plunger actuated by the firing arm pushes the piston forwardly, the firing boss deforms the primer cap transverse wall and cause detonation of the propellant charge. The propellant gases first move the piston rearwardly to uncover the firing cap housing, whereby the gases are expanded in the rear compartment before reaching behind the projectile in the front compartment. Therefore, the projectile is propelled without being ruptured.
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