Looking for the coolest stock on the market, here it is. This stock is based off the mp5 sliding stock. You will find nothing like this on the market anywhere. This is not an airsoft piece converted to fit your gun; this is a whole new product. As with all Metadyne's parts you will find no cheap plastic here just solid aluminum, the rails have been positioned so they slid along the top portion of the gun. This allows the rails to slide over the top of the air hose and collapse the stock completely. The button mechanism uses a heavy duty spring, locking the stock into any one of its 6 positions. All the pieces are hard anodized to a black satin finish that matches the a5.