High impact durability

Boost the rate of fire with the Max M1 motor paired with a lower power spring

1 "2 Way Fixed" Non-Recoiling Outer Barrel

you need to put together the stock and the upper of the A2

HK Army Crash Arm Pads blowback High impact durabilityProduct Overview The HK Army Crash Arm Pad System. Designed for high impact performance, with comfort and flexibility in mind. The contour, dual layered pad system absorbs shock and reduces elbow joint impact. Developed with durable, lightweight materials, the Crash Arm Pad provides fluid mobility, comfort and breath ability. The 4 way stretch, inner lining increases coverage and acts as a cooling agent for hot days. Enhanced comfort and durability