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The TDC is renowned as one of the best VSR 10 upgrades so the hop arm is designed especially for that modification. The arm itself doesn’t move just fills the entire hop arm gap in the chamber so only the nub itself can move in 2 directions up and down. This design will stop the normal VSR hook and give full nub to patch contact with no pivoting parts which will give consistent straight shots.
For stock chamber only.
Make sure to follow the installation guide here:
Fantastic product!! Even messaged Paul smith myself to tell him! :)