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Compatible with VFC / Umarex G17 Gen5 / G19 Gen4 / G19X / G45 GBB
Aluminum construction.
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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.