G&G GR4 CQB-R AEG The GR4 CQB-R by G&G Armament is the best metal body M4's that we sell. Manufactured out of Taiwan, these guns are a great alternative and better quality than similar models made in China. With the shorter barrel and adjustable stock, this rifle works best in CQB and medium distance engagements. The upper receiver, lower receiver, buffer tube, barrel assembly, rear sight tower, Rail Interface System, and magazine are all highly durable aluminum alloy and steel. The rest of the exterior parts as appropriate are a durable mixture of nylon, fiberglass, and plastic. The mechbox has been factory upgraded with zinc gears, 8mm bearings, high tension spring, and a 25000 rpm Hi-torque long axis motor. The lower receiver features an engraved G&G logo for easy identification and a sling adapter has thoughtfully been added to the buffer tube for easy sling mounting. The standard multi-position telescoping stock has been replaced with a telescoping crane-style stock and the 16 inch barrel replaced with a 11.5 inch one with a tenderizer style flash hider. The rifle comes with the standard G&G high capacity 450 round magazine and there are plenty of other replacements available. As an added bonus, a vertical foregrip is included in the packaging. The battery compartment is located inside the crane stock of the rifle and can be difficult to install the first couple of times. It is accessed by pinching the two tabs on the underside of the stock plate and pull of the plate itself. Once that is done the battery cells can be installed in the appropriate tubes for an accurate fit. Airsoft players recommend this as fun alternative to Classic Army AEGs. Note: Does not include battery or charger