The Benelli CB-M2 was an Italian simple blowback

submachine gun A submachine gun (SMG) is a magazine-fed, automatic carbine designed to fire handgun cartridges. The term "submachine gun" was coined by John T. Thompson, the inventor of the Thompson submachine gun, to describe its design concept as an autom ...

resulting from a joint venture between

Benelli Benelli may refer to: *Benelli Armi SpA, an Italian firearm manufacturer *Benelli (motorcycles), an Italian motorcycle manufacturer *HSR-Benelli, an Austrian-Italian manufacturer of personal watercraft * Andrea Benelli (born 1960), Italian sports sh ...

and

Fiocchi Munizioni Fiocchi Munizioni (Fiocchi Ammunition) is one of Italy's largest and oldest manufacturers of ammunition. The company's headquarters and main production plant are in Via Santa Barbara in Lecco, Italy. History Fiocchi Munizioni was founded on 3 ...

. The weapon was chambered for the semi-caseless 9mm AUPO round. The AUPO bullet had an elongated, hollow base that acted as the case. The propellant filled the hollow space, and was sealed into the bullet with a fulminate plug. The AUPO round was "semi-caseless" because the hollow base of the bullet detached from the bullet itself after firing. However, it was not necessary to eject it from the side of the weapon as in a normal cartridge, because the base followed the bullet down the barrel and exited at the muzzle, in a similar fashion to a

sabot Sabot may refer to: * Sabot (firearms), disposable supportive device used in gunpowder ammunitions to fit/patch around a sub-caliber projectile * Sabot (shoe), a type of wooden shoe People * Dick Sabot (1944–2005), American economist and busi ...

. This simplified the action of the weapon, allowing it to move back and draw another round from the magazine, since there was no case to eject. With the omission of the ejector mechanism and the ejection step in the action, there were fewer moving parts to jam and cause unreliable functioning of the weapon. The CB M2 never found any customers and the project was shelved.

External links

Benelli CB-M2 at Modern Firearms

References

{{Caseless Firearms Benelli Armi SpA Caseless firearms Submachine guns Submachine guns of Italy

See also

External links

References