Benelli CB-M2 Caseless SMG in 9x25mm AUPO made in the early 1980s. The project got shelved in 1985 due to complexity and lack of advantages over conventional submachine guns.

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Looks more like Volcanic-style 'rocket balls' than actual caseless.

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Or like the Guycot 40-shot chain pistol that ian made a video about it years ago.

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Aesthetics wise, it kinda reminds me of the Chropei SMG from Greece

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Is there exists ammo where the case acts like the chamber?

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The Roper shotgun, the Agar Machinegun, and a lot of breechloading swivel guns.

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65% more bullet per bullet. Cave Johnson approved.

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Interesting! An interesting ammunition. Case is permanently attached to the projectile. https://guns.fandom.com/wiki/9%C3%9725mm_AUPO?file=AUPO.jpg

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