Holosun HS510C Spacer Lower 1/3 Co-Witness - Matte Black Tactical Sight Accessory

The Holosun HS510C spacer is a lower 1/3 co-witness mounting solution designed to pair your HS510C red dot sight with magnified optics or backup iron sights. If you're running a rifle setup where you want multiple aiming systems—say a primary magnified scope with a cowitness red dot, or iron sights behind a red dot—this spacer raises your HS510C to the lower 1/3 co-witness height, keeping your sight picture aligned across platforms. It's the kind of accessory that makes sense for dedicated precision rifles, competition builds, or tactical carbines where versatility matters.

Built in matte black to match the HS510C and integrate cleanly into any tactical or hunting platform, this spacer is straightforward: it positions your dot at the right height relative to your rail system so co-witnessed backups work as intended. No surprises, no complications—just geometry that lets you trust your sight picture across different optic configurations.

If you're setting up a rifle where a backup aiming system is part of your plan, or you're stacking an HS510C with another optic, this spacer ensures everything aligns properly. It's a small part with a specific job: keep your red dot where it needs to be.

Key Features

• Lower 1/3 co-witness height for HS510C red dot sight
• Matte black finish matches HS510C and modern tactical platforms
• Designed for multi-optic setups with backup sighting systems
• Straightforward mounting for HS510C-compatible rail systems

Frequently Asked Questions

What is a lower 1/3 co-witness spacer, and why would I need one?

A lower 1/3 co-witness spacer raises your red dot to a specific height above your rifle rail so that iron sights or a secondary optic positioned lower can be viewed "co-witnessed"—meaning both aim points align in your field of view. This lets you use a primary optic and backup sights together without one blocking the other.

Does this spacer work with all HS510C mounts?

This spacer is designed for the HS510C red dot sight. Confirm your HS510C mounting system is compatible with standard lower 1/3 co-witness hardware before purchasing.

What's included with this spacer?

You are receiving the Holosun HS510C spacer in matte black. Verify that your HS510C mount and rail system are ready to accept this component.