A quick teaser video of one of the Classic Army Advanced Series AEGs, the CA083M 13" KeyMod AEG... "The Classic Army M4 ARS4-10 is an M4 with a 13in. free float keymod rail and an 14.5in. outer barrel. The monolithic profile rail system has a standard picatinny configuration on the top rail, allowing for fitting of standard railed mounted scopes or other accessories. The gun features an ergonomic grip, flip up front and rear sights, and a retractable crane stock, and a sling adaptor plate. This gun comes individually serial numbered and comes with 2x 300rd metal high capacity magazines.

Internally, the gun has a 9mm bearing gearbox, wire cut steel 21:1 ratio gears, inline mosfet protected trigger contacts, stainless steel bore up cylinder, aluminum bore-up cylinder head, metal spring guide with bearing, 6.03mm tightbore barrel, silver low resistance trigger wiring, and a quick change spring system. The wiring utilizes a low heat deans plug and comes with an adapter for tamiya connector batteries. This gun is lipo-ready right out of the box. It will shoot 375-400 fps using 0.20g BBs and 800-900 rpm using a 9.6V battery. The quick change spring system allows for fast and easy spring changes without having to go into the gearbox."