The Holosun HS510C lower spacer for 1/3 co-witness height (part no. 510C-SPACER) lowers the HS510C reflex sight to align its dot with standard AR-height iron sights for a proper 1/3 co-witness setup. Holosun machines the spacer to a precise 1.6-inch length for a direct, drop-in fit under the HS510C base. Among mounting-specific red dot mounts, this HS510C spacer is a purpose-built accessory rather than a universal part.

Key Specifications

• The length measures 1.6 inches, matching the HS510C base for a direct fit.
• The spacer is designed specifically for the HS510C, ensuring correct co-witness geometry.
• The mounting height configuration is 1/3 co-witness, positioning the dot to align with lowered iron sights.

Frequently Asked Questions

Is this spacer specific to the HS510C? Yes, it’s built for a direct fit under that model’s base.

What co-witness height does this spacer create? A 1/3 co-witness, aligning the dot with lowered AR-height iron sights.

Buy the Holosun HS510C Spacer, 1/3 Co-Witness

An HS510C set up for 1/3 co-witness gets the correct spacer here, machined to a direct fit. Order it from our Lubbock, Texas gun shop and it ships fast.