Holosun Lower 1/3 Co-Witness Spacer for HS510C - 510C-SPACER
Holosun Lower 1/3 Co-Witness Spacer for HS510C - 510C-SPACER, Mounts between the 510C and QD mount, changes height to a lower 1/3 co-witness height of 1.63 inches. Mounting hardware included.