Inspire BFG SMG - Up to 22 balls per second (bps) in semi-auto mode, up to 15 bps in full-auto and burst modes, change modes on the fly with a sliding selector switch, venturi bolt, low pressure (175 psi) operation reduces kick and noise, break beam eyes, one button operation to turn eyes on and off, dual ball detents, low profile feed neck and clamping feed neck included, 10" microhoned military style barrel, one-piece metal receiver, composite lightweight body, hidden battery door, built-in sling mounts, ported machine gun shroud, carstock. Uses A5 barrel thread and accepts A5 stocks (carstock as pictured is included). Requires 9v battery (not included).