Feature：

➤ 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
➤ Additional plastic vertical tensioner for backup or user can modify it by youself.