The VFC Avalon M4 SOPMOD carbine is spot-on-- spot-on in the details so you can be spot-on on the field. The Avalon M4 SOPMOD carbing features a quad rail with rail covers installed from the factory. The quad rail assembly is sitting behind a standard A2 style front sight. The grip and six posiiton adjustable stock are finished in black to match the quad rail and reciever halves. The M4 SOPMOD is equipped with an upgraded MOSFET and the tough Avalon ECS gear box. This AEG is best powered by an 11.1v LiPo battery (not included) and can accept most standard M4 style magazines. Expect .20 gram BBs to fly from the Elite Force M4 SOPMOD at 390 FPS.