●For GHK GLOCK Pistol Series
●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
●Addtional Vertical tensioner for backup or user can modify it by youself.