The Springfield Armory Agency Optic System Mounting Plate (part no. PH5077N-509-PLATE-RET) lets a Springfield 1911 DS pistol cut for the Agency Optic System mount a Holosun 509 red dot directly, without any additional slide milling. It bolts on as a direct replacement plate, keeping the install straightforward for anyone who already owns an AOS-cut slide.

Key Specifications

• Built for Springfield Armory’s Agency Optic System (AOS) cut on 1911 DS pistols.
• Sized specifically to the Holosun 509 footprint.
• Finished in black.
• Direct bolt-on replacement plate for an AOS-cut slide, no additional milling required.
• Manufactured by Springfield Armory.

Frequently Asked Questions

Does this work with any 1911, or only AOS-cut slides? It is built specifically for Springfield Armory’s Agency Optic System (AOS) cut on 1911 DS pistols; a slide without that cut will need separate milling.

Will this fit any red dot with a Holosun 509-pattern footprint? This plate is sized for the Holosun 509 footprint specifically; confirm your optic’s exact mounting footprint before ordering.

What finish does the plate come in? It ships finished in black to match a standard 1911 DS slide.

Buy the Springfield Armory AOS Mounting Plate

Order the Springfield Armory AOS Mounting Plate for the Holosun 509 from our Lubbock, Texas gun shop. Shop more Springfield Armory parts or the full Other Rifle Accessories & Parts lineup.