The GR16 CQW Rush by G&G Armament is one the most unique M4 series AEGs that we sell. Manufactured out of Taiwan, these guns are a great alternative and better quality than similar models made in China. This mechbox is built with G&G's new patented pneumatic blow back system. During the firing sequence, the rifle actually produces a an effect similar to that of a real rifle during recoil! With the carbine length barrel and adjustable stock, this rifle works best in medium to long distance engagements. The 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 like the upper and lower receiver 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 standard pistol grip replaced with an ergonomic model. As if this gun couldn't get any cooler, the forward assist actually functions as a piston reset button. No more worries about lost spring tension! Additionally, the rifle features a hide away folding front sight, aggressive attack style flash hider, reinforced trigger guard and skeltonized charging handle. The rifle comes with the standard G&G high capacity 450 round magazine and there are plenty of other replacements available