The G&G GR4 CQB-S MINI is a high quality AEG made by G&G Armament. This gun is specifically designed for CQB play, and in our opinion it is perfect for it. It is made to shoot at 330 FPS which makes it legal at CQB fields. The gun is lightweight, compact, and easy to use. The gun has many metal components including the RIS Quad Rail, outer barrel, buffer tube, and gearbox. The other parts of the gun are made of a high strength ABS plastic. G&G has done somethings with this AEG that make it very CQB friendly. Instead of the standard high capacity magazine that many of their guns come with, this one comes with a 120 round mid cap. Although the midcap holds less total rounds, it is better for CQB because you do not have to wind it to keep firing. They also have a shorter barrel on this AEG to make the gun easier to maneuver around corners with. The metal rail system rail system allows the user to add accessories such as flashlights, lasers, and tactical foregrips. The top rail can be used for adding many different types of red dot sights or other optics. Internally the gun is very well made. G&G is known for making high quality AEGs that are reliable and perform well and this gun is no exception. It has a built in hop-up for increased range and accuracy. The hop up adjustment can be accessed by opening the dust cover on the side of the weapon. This gun has a telescoping crane stock. The length of the stock can be adjusted for the user's comfort and it also houses the battery. We recommend using a 9.6v NiMH nunchuck style battery, but a 7.4v stick type lipo battery can also be used. Battery and charger sold separately.