- for VFC & GHK M4 / AR GBB
- For Maple Leaf GBB-spec/Crazy Jet Inner barrel.
- Dual adjustable system, user can adjust the hop from the factory outter barrel.
- Or adjust the fix screw on the chamber with M2 allen key (just like WE / VFC GBB series).
- The hop chamber also fit with some VFC M4/AR15 GBB series.
- Recommend using "Super" & "Wonder" GBB Hop rubber in this hop chamber without modification.
- Other GBB hop bucking that NEEDS to cut off the positioning lug on the side to fit into the chamber.