Securing plate that slots into the gas-tube under the rear sight. Is the 5th support point for the B-33 dust cover, requires a special short screw for installation (supplied on request).
Replacement part in the event of loss or purchase of a used incomplete B-33 kit.
NOTE: The plate needs a special short screw (NOT the regular 5x10mm screws usually supplied with handguards). If lost, please state that you need a replacement.