Designed specifically to fit the FN Low Profile Optics Mounting System, the new Apex Optic Mount allows the user to securely mount the Aimpoint Acro P-1 optic to the slide of the FN 509 Tactical. The low profile design of the mounting plate insures co-witnessing between the suppressor height sights and the Acro P-1. The Apex Optic Mount is machined from a billet of heat-treated steel and black Melonite finished for enhanced durability.