Maple Leaf Hop up Chamber for VFC G series (Glock)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.