Fortis Manufacturing, Inc. License Gen 2, Semi-automatic, Stripped Lower Receiver, 223 Remington, 556NATO, Black Color, Anodized Finish, Carbon Fiber L-7075-GEN2-S Introducing the Fortis License Lower Receiver. Made from 7075 T6 billet aluminum. The GEN II has all the same features from the first edition, but with added integrated carbon fiber.