G&G GR16 R4 Full Stock R.I.S. Carbine AEG The GR16 R4 Full Stock R.I.S. Carbine by G&G Armament is a great metal body M4 style AEG. Manufactured out of Taiwan, these guns are a great alternative and better quality than similar models made in China. With the carbine length barrel and full size stock, this rifle works best in medium to long distance engagements. The upper receiver, lower receiver, 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. 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 butt stock of the rifle. It is accessed by pulling open the small door located on the butt plate and then sliding the battery into the compartment. Airsoft players recommend this as fun alternative to Classic Army AEGs. Note: Does not include battery or charger