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●For VFC SIG P320 M17 M18 Pistol Series
●Metal vertical tensioner design to decrease the original parts tolerance
●TDC 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 plastic vertical tensioner for backup or user can modify it by youself.
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