The ECHO 1 M4 CQB Crane Stock is a great stock if you're looking to change up the look on your gun or relocate the battery to the rear. This stock does not come with a buffer tube but will fit on most airsoft M4 buffer tube applications. The back plate of this stock is easily removed to give access to any battery wires that may be back there. This is stock is made from a durable plastic material that's lightweight and strong, it accurately replicates a real gun's crane stock. Swap out your old school stock for this robust and modern looking crane stock.