This DBoys M4-TDW Stock fits the DBoys M4-TDW, the Echo 1 MK16, and most AGM SCAR series AEGs. This stock is made entirely of impact resistant polymer and includes all necessary replacement pieces to mount the stock. This is the advanced design rear stock found on most SCAR series AEG rifles. With this new stock, you can forget about having to take the stock apart just to put in the battery. The rear stock features an opening cheek rest piece, which flips up to reveal a battery storage compartment. Simply lift up the cheek rest, place the battery inside the stock, and youâ€™re ready to go! The DBoys M4-TDW rear stock is foldable and also adjustable (retractable) in three positions. This stock is fully customizable for any shooting position. Only at Airsoft Megastore can you find this factory replacement stock for under $50!