The latest addition to the M4 family from JG, the JG M4 Pistol CQB Airsoft Gun JG-F6631. JG has done a better job on making M4 than anyone else. This full metal gear box Version 2 can take a 11.1v battery, which makes its rate of Fire utlra fast ! This JG M4 pistol airsoft gun featuring the M4 pistol body with no stock, high speed motor, high precision metal gear box, improved gearbox design with increased shooting accuracy and initial starting speed. New design performs excellent and high durability and putting this M4 to the next level of perfection in airsoft. The Body This JG M4 pistol airsoft gun combined with a high-strength ABS upper and lower receiver. There is no stock on this M4 pistol for excellent CQB maneuverability; very easy to move around and go very smooth on turning at corners. It has a Shorten barrel to suit the need for CQB and it also comes with full metal rails. For such a compact fully automatic pistol, there is no room for battery. Therefore it comes with a external battery case which holds a 10.8v custom battery. This M4 pistols is made with Lipo Ready spec., therefore you can replace the stock 10.8v NiMh battery with a 11.1v Lipo battery for higher rate of fire and trigger response. The top rail is made in metal with two flip up sights at the fron t and back. You can easily remove the sights or move them to position you wanted on the weaver top rail. The back butt plate is a rubberized piece with a Quick Detach Sling mount points. You can attach the included QD sling mount on any sling for carry around. The Internal This airsoft gun is designed for CQB with high speed setup. This full metal gear box Version 2 can take a 11.1v battery and its Lipo Ready. You can maximize the potential of this airsoft gun with a 11.1v lipo battery to pump out all the power of the gun. With Lipo battery, it can shoot over 1000 round per minute! The High performance full metal gearbox and enhanced internal parts makes this airsoft gun high speed and CQB ready. It is shooting with 330-350 fps, which is well within the limit of any CQB field. FPS / ROF High speed setup with range from 330 to 350 FPS with 0.2g BB. With a 11.1v battery 1000+ rounds per minute.