Models View all Hephaistos - Venator (Light foldable carbine concept) 35 251 9 Hephaistos - Poena (Lightwheight automatic shotgun concept) 43 516 9 300 AAC Blackout (300 BLK) cartridge 34 640 4 .308 Winchester (7,62x51) cartridge 48 1134 3 7,62x54mmR "Mosin-Nagant" cartridge 37 424 0 7mm Mauser (7x57) cartridge 22 337 0