G&G GR16 Carbine AEG The GR16 Carbine by G&G Armament is the one of the most popular 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. The upper receiver, lower receiver, buffer tube, barrel assembly, carry handle, 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 rifle comes with the standard G&G high capacity 450 round magazine and there are plenty of other replacements available. The battery compartment is located inside the forearm of the rifle and is accessed by pushing down on the delta ring and removing one of the handguards. Airsoft players recommend this as an upgrade to Echo 1 and JG or an alternative to Classic Army. Note: Does not include battery or charger