- Umarex - VFC Glock version
- 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
