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●For UMAREX (VFC) G17 Gen5, G19 Gen4, G19X & G45

●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.

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