Models View all Hephaistos - Venator (Light foldable carbine concept) 35 255 9 Hephaistos - Poena (Lightwheight automatic shotgun concept) 43 517 9 300 AAC Blackout (300 BLK) cartridge 34 652 4 .308 Winchester (7,62x51) cartridge 49 1151 3 7,62x54mmR "Mosin-Nagant" cartridge 37 428 0 7mm Mauser (7x57) cartridge 22 338 0