Material: Fiber Polymer

it is just like the regular G series 50 round mag

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

High impact durability

Compatibility: Lancer Tactical ProLine

HK Army Crash Arm Pads blowback Material: Fiber PolymerProduct 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