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The 9×25mm AUPO was an experimental military cartridge developed by Fiocchi Munizioni specifically for use in the Benelli CB-M2 submachine gun.
Details[]
Similar to the ubiquitous 9×19mm Parabellum in terms of ballistics and physical measurements, the 9×19mm AUPO round was advertised as caseless. This, however, is not in the context of a solid block of propellant with a bullet inside of it, as the cartridge's "case" was permanently attached to the bullet, and left the barrel together with the bullet when firing, in a similar manner to very early unitary cartridge designs like the Volcanic ball. The powder is packed in the hollow interior behind the permanently-affixed bullet with the cartridge using a ring primer built into the casing. The powder, along with the ring primer, is sealed inside with a lid of lacquer or resin.
Trivia[]
- A similar form factor of a projectile and casing consolidated into a single piece exists in the Russian 40×53mm grenade.