MetalTac Airsoft M-Series Magazine Polymer-Mag High-Cap 300 Round for AEG Airsoft Guns, Fast loading Wheel, Ultra durable (Black) Airsoft M4 M16 Polymer Hi-Cap Magazine Constructed from durable polymer and comes in black color Magazine with capacity of 300 rounds of BBs Based off Tokyo Marui design. Works with any TM compatible airsoft guns Comes with MetalTac 30 Day Warranty