This Spring powered airsoft rifle is constructed from a durable and lightweight polymer with a full metal barrel assembly Adjustable polymer stock makes it quick and easy to adjust the overall length of the MPX for improved maneuverability in CQB situations The full length picatinny top rail is perfect for the addition of your favorite optic accessory, while additional picatinny rail sections along all four sides of the hand guard can house accessories including foregrips, flashlights, or lasers. Because this rifle is powered by a high tension internal spring, you don't have to worry about having spare gas canisters or charged batteries. The overall compact design of the SIG1 MPX ensures players of all sizes can easily operate this rifle without restrictions or fatigue. The included drop-free magazine holds 26 BBs, with a reservoir in the back of the magazine that holds a spare 500 BBs.