Check out these Matrix Zombie Killer M4 AEGs from Evike.com... "The Matrix full metal Zombie Killer Series AEG rifles are high quality AEG made exclusively to the highest specification of the JG / CYMA OEM factories with unique exterior conversion kits already installed and a 8mm fully reinforced and upgraded metal gearbox that is compatible with all major platforms and fully upgradable. The entire rifle, where it should be metal, is metal. (Unlike some Chinese made AEG sold by other retailers, with ABS barrel, stock tube, dust cover, and other essential parts for the sole purpose of lowering cost.)

The Zombie Killer M4 CQB is designed to be a complete system ready for battle. It is equipped for maximum mobility, with integrated RIS system, integrated "TANK TYPE" retractable stock, quick one point sling adapter, ergonomic advanced motor grip, enlarged metal trigger guard, hi-cap magazine, unique laser engraving, one piece metal outer barrel, flip-up front and rear sight, PEQ-15 box and more!"