Holosun AL1/3CW1.63 1.63" Sight Mount / Riser, 1/3 Lower Co-Witness. Manufactured from 6061 T6 aluminum, this 1.63" T-1 optics interface Holosun standard sight mount is perfect for providing a lower 1/3 co-witness to the T-1 via a cross-bolt and clamp. Create the ideal sight picture with this mount and your Holosun T-1 optic system.
