Holosun HS510C Mount – Lower Spacer ⅓ Co-Witness for Optic Compatibility

Elevate your optic—literally—with the Holosun HS510C Spacer for a true lower 1/3 co-witness setup.

Designed specifically for the Holosun HS510C open reflex optic, this precision spacer allows shooters to achieve a lower 1/3 co-witness with standard AR-height iron sights. It raises the optic just enough to improve sight picture while maintaining a backup view of your irons through the bottom third of the window—perfect for those who prefer an uncluttered view or run magnifiers.

Machined for a snug fit and easy installation, this spacer delivers added versatility without compromising the HS510C’s renowned stability or ruggedness. Whether you’re optimizing for comfort, speed, or personal preference, this is a quick and reliable upgrade.

Features:

• Compatible with Holosun HS510C open reflex sight

• Provides lower 1/3 co-witness height

• Ideal for AR-15 platforms and other rifles with standard-height iron sights

• Quick and easy to install

• Durable, lightweight construction

• Maintains secure mounting and zero retention

Optimize your optic height and get that perfect co-witness with the Holosun HS510C Spacer—a simple upgrade that delivers serious shooting benefits.