Holosun 510C Spacer — Lower 1/3 Co-Witness Mount

Holosun 510C Spacer — optic spacer. This spacer raises the Holosun 510C open reflex sight to provide a lower 1/3 co-witness with standard iron sights and sight-height setups.

This spacer is designed to alter the sight height of a Holosun 510C to achieve a lower one‑third co‑witness relationship with iron sights or backup sights. It addresses the need for a lower optical mounting position while maintaining secure attachment and consistent alignment for the 510C open reflex optic.

• Designed for use with the Holosun 510C open reflex optic to provide a lower 1/3 co-witness.
• Machined from 6061‑T6 aluminum for a balance of strength and weight.
• Overall dimension: approximately 0.90 x 2.00 x 3.55 inches.
• Length listed as 3.55 inches; width listed as 2.00 inches; height listed as 0.90 inches.
• Single-piece spacer; sold as one piece.
• Surface finish and attachment hardware details are not provided in the supplied data.

Specifications & Construction

• Material: 6061‑T6 aluminum.
• Dimensions: 0.90 in (height) x 2.00 in (width) x 3.55 in (length) — values provided in product attributes.
• Pieces: 1 (single spacer).
• Intended operating method: passive spacer inserted between optic and mount to alter sight height.
• Durability: aluminum construction suitable for typical mounting stresses; environmental rating or finish not specified in provided data.

Compatibility & Intended Use

• Explicitly fits the Holosun 510C open reflex optic.
• Intended to achieve a lower 1/3 co-witness with iron sights or backup sights when used in appropriate mounting configurations.
• Typical setups include reflex optic as a primary sight with iron sights or back‑up sights aligned for lower one‑third co‑witness; suitable for range, training, or duty-style mounting where the 510C is used.

This description reflects the provided product data for the Holosun 510C spacer and its measured dimensions and material. No additional specifications or manufacturer hardware details were added beyond the supplied attributes.