MP7RotexII.jpg
It's the Rotex system. The flash hider is seated snugly in the connector. The knurled rotating collar has a an eccentric hole and a ratchet system. As the system is tightened, the eccentric cutout engages the groove of the flash hider and is held securely in place via the ratchet. It is released via a button. This method allows for infinite indexing.



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