Maple Leaf GHK M4/VFC GBB Hop-Up Chamber w/Rubber

CNC hop-up chamber for GHK M4
Also works with VFC M4 GBBR (not for VFC variable hop system)
For use with GBBR inner barrel, Crazy Jet barrels by Maple Leaf recommended for best results
Includes Maple Leaf 70 degree pop-Up rubber.