ProWin CNC Aluminum Hop Up Chamber for M4 cree led Each Li-Ion cell has a

Each Li-Ion cell has a PCB (Protection Circuit Board) that prevents the cells from being over-charged and over-discharged during use

The rear stock is manufactured from authentic Dupont Zytel polymer for superior wear and damage resistance

Then wind the wheel on the bottom for 30 seconds or more

High quality polymer receiver and metal rail and rear stock assembly

We will have to open the clamshell

ProWin CNC Aluminum Hop Up Chamber for M4 cree led Each Li-Ion cell has aThe ultimate upgrade for your Airsoft Gun Prowin CNC Aluminum Hop Up Chamber for M4 M16 and compatible AEGs. Perfect compliment to a Polarstar equipped airsoft gun. Upgrade Give your hopup an upgrade boost from Airsoft Atlanta