- For VFC (Umarex / Elite Force) Glock series 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
- An additional vertical tensioner is available as a backup or for users to modify themselves.