M16 Fixed Stock -Highly detailed stock pipe, which is similar to real pipe. -Special designed battery case to ensure prefect fit. -One-piece fixed stock to increase durability and strength. -Capable of storing large 9.6V - 12V A2 style battery with no modification needed. -Stock body is made of PA66,the same material used on real M4 stocks. -Will fit for Marui M4/M16 series and most M4 metal bodies.