Holosun 509 Adapter — Picatinny Lower 1/3 CW

Holosun 509 Adapter to Picatinny Lower 1/3 CW is a mounting adapter designed to position a Holosun 509 optic for a lower 1/3 co-witness with iron sights. It secures the optic to a standard Picatinny rail to provide a lowered optic sightline.

This adapter’s primary purpose is to lower the mounted Holosun 509 optic so the iron sights remain visible in the lower portion of the sight picture. It is intended for use on Picatinny-equipped firearms where a lower 1/3 co-witness between a red dot and backup iron sights is required. The mount is built for regular field use and is described as robust enough for demanding operating conditions.

• CNC-machined from 6061 aircraft-grade aluminum for consistent fit and machining tolerances.
• Type III hard-anodized finish for corrosion resistance and surface durability.
• Provides a lower 1/3 co-witness when used with a Holosun 509 optic and iron sights.
• Designed to attach to standard Picatinny rails for broad compatibility with Picatinny-equipped platforms.
• Fastened with stainless steel Torx-head M3 screws to provide a secure, wobble-free mount.
• Precision fit intended to minimize movement under recoil and regular use.
• Form factor and construction suited for routine field or range use.

Specifications & Construction

Materials and manufacturing: CNC-machined 6061 aircraft-grade aluminum with a Type III hard-anodized finish. Fasteners are stainless steel Torx-head M3 screws. The construction emphasizes a secure interface between the Holosun 509 optic and a Picatinny rail.

Durability: The finish and materials are intended to resist wear from handling, recoil, and typical field environments.

Compatibility & Intended Use

Fits: Picatinny rails. Specifically designed to position a Holosun 509 optic for a lower 1/3 co-witness with iron sights. Typical setups include a Holosun 509 as the primary optic with the firearm’s iron sights retained as a backup in a lower 1/3 co-witness configuration.

This adapter is suitable for shooters who require a lowered sightline for their Holosun 509 while retaining sight picture awareness of iron sights. It is presented as a durable mounting solution for routine, duty, or range configurations on Picatinny-equipped platforms.