ARISAKA OFFST OPTC PLT 13 HOLO 509T

Description

The Arisaka Defense OOM-P13 is a replacement optic plate designed for shooters running the Holosun 509T or HE509-RD on an Arisaka Offset Optic Mount. The offset mount concept positions a secondary optic at roughly 45 degrees from the bore axis, letting a shooter transition from a magnified primary optic to a close-range red dot without removing a hand from the rifle or changing cheek weld. The plate is what makes that system optic-specific: it interfaces directly with the 509T footprint, so the optic sits precisely and repeatably without shimming or improvised adapters.

Arisaka machines the plate to a standard height, which is the correct choice when co-witness with iron sights is the goal on an offset setup. The finish is a black hard anodize, which is the same surface treatment Arisaka applies across their mount hardware — it resists abrasion from the contact surfaces the plate will see during installation and use. Attachment uses Torx fasteners, which resist cam-out under the torque values needed to keep an optic secure through recoil cycles. If you already own an Arisaka Offset Optic Mount and are adding or switching to a Holosun 509T, this plate is the direct swap to make that combination work correctly without modification.