Undead Apocalypse Zombie Siege Z37 Airsoft Rifle: * Metal barrel * Adjustable/removable stock * High-capacity magazine holds 400 rounds * Quad rail mounting system for accessories * Removable aiming optic * Carry handle with adjustable rear peep sight * Removable forearm support grip * Weight: 2 lbs * Length: 28" * Power source: spring * Caliber: 6mm * Safety: lever * Material: synthetic * Model# Z37