Holosun 510CSPACER | Lower 1/3 Co-Witness

This spacer is designed to position the Holosun 510C open reflex optic at a lower one‑third co‑witness with standard iron sights. It is produced from 6061‑T6 aluminum and supplied as a single piece to provide repeatable optic height. Use this spacer where a reduced sight picture height is required for carry or range/competition setups.

Product Specifications

• The material is 6061 T6 Aluminum.
• The model is 510C Spacer.
• The product is supplied as 1 piece.
• The height measures 0.9000 inches.
• The width measures 2 inches.
• The length measures 3.5500 inches.
• The overall dimensions are 0.90 x 2.00 x 3.55 inches.
• Designed specifically for the Holosun 510C open reflex optic.
• Provides a lower 1/3 co-witness when used with compatible iron sights and mounts.
• The listed finish is black.
• The item includes the product identifier UPC 605930624960.

This spacer offers a straightforward, mechanically simple method to set optic height for shooters who prefer a lower sight picture. Its 6061‑T6 aluminum construction balances light weight with durable support for the optic, making it suitable for carry-oriented pistols and for shooters dialing in sight height on the range or in competitive formats. If you require a reliable, minimal-height solution for a Holosun 510C, this spacer provides a clean, repeatable mounting option.