Maple Leaf Hop-Up Chamber Set for GHK/UMAREX GLOCK 17 GBB

Hop wheel + Vertical tensioner design to decrease the original parts tolerance

Vertical tensioner with curve shape design for good setting of BBs

Stable Hop effect and better air-seal

Suitable with Maple Leaf GBB/VSR Hop rubber and pistol inner barrel or "Crazy Jet" inner barrel

Additional Vertical tensioner for backup or user can modify it by yourself.