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The GLOCK MOS (Modular Optic System) Adapter Plate Set 01 (33531) is a factory OEM part that offers different mounting plates for various optics to be mounted on your pistol. The MOS Adapter Set includes a Torx screwdriver and 4 Torx screws to install Glock MOS adapter plates.
Fits: Gen 4 MOS Equipped G34, G35, and G41.