The Classic Army M4 10" ARSS4 Keymod carbine in a black finish is one of the newest rifles from Classic Army. The ARSS4 features a 10 inch keymod rail with keymod slots at the 3, 6, and 9 o'clock position, which provides plenty of space for mounting keymod accessories or keymod picatinny rails. Internally this gun features Classic Army's 9mm full metal gearbox with CNC cut high torque steel gears, high torque motor, reinforced piston and a 6.03 tightbore barrel. These rifles also include a mosfet to protect your trigger contacts from shorting out. Step up to the plate with the Classic Army ARSS4 10" Keymod Carbine.