The SUB-16 is a gas operated, self loading rifle in .223 Remington caliber. Several unique features make the SU-16 a versatile sporting firearm. An integrated picatinny rail for mounting different sight systems. The forend folds down to form a bipod for increased accuracy. The stock can store spare magazines. Two 10 rounds or one 20 or 30 rounds. The stock and trigger mechanism can be folded forward for added safety and to facilitate secure storage or carry under extreme conditions. The SUB-16 has a conventional gas piston operation and utilizes the proven M-16 breech locking system. It is compatible with standard M-16 magazines.