ZCI M4 Outer Barrel Set For AEG / GBB

ZCI M4 Outer Barrel Set For AEG / GBB A complete outer barrel set with an AEG end and GBB end concluded allowing for several lengths of outer barrel. It comes with the bases for GBB and AEG and a 3", 5" and 7" barrel extension so you can mix & match any of these sizes. Features: Aluminium construction 3", 5" & 7" extensions Fits AEG or GBB M4