Arisaka Defense Offset Optic Mount (OOM-BASE)

Color: Black
Sale price$100.00
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*NOTE - This Listing is for the offset BASE ONLY, plates are available and sold separately. Available Plates can be found linked in the description below* 

The Patent Pending Arisaka Offset Optic Mount is a modular mounting solution that allows the user to select a 35 or 45 degree offset position for a red dot sight without requiring additional components. The 35-degree position brings the red dot sight up closer to slimmer, smaller scopes, while the 45-degree position provides additional clearance around wider turrets or larger, higher magnification scopes.

  • Designed to be attached to the top Picatinny rail of an AR15 rifle.
  • When the rifle is canted to make use of the offset red dot sight, the optic remains centered over the bore and maintains a lower 1/3 co-witness height.
  • The base and optic plates can be reversed, allowing for use on the left or right side.

A wide selection of red dot sights are supported with interchangeable optic plates:

Standard height (for 1.5″ to 1.8″ scope mounts):

  • Plate 1: Docter, Eotech, Insight, Meopta, Vortex Venom/Viper, Burris Fastfire III
  • Plate 2: Trijicon RMR, SRO, Holosun 407C, 507C, 508T
  • Plate 3: C-More, Vortex Razor, SIG Romeo 3
  • Plate 4: Leupold Delta Point Pro, JPoint, Shield RMS, SIG Romeo Zero
  • Plate 5: Aimpoint Micro T1/T2/H1/H2, SIG Romeo 4, 5 (not 5X), Holosun HS403 (not A), HS503, HS515, HS530
  • Plate 6: Aimpoint Acro
  • Plate 13: Holosun 509T
  • Plate 15: SIG Romeo 1 and Romeo 1 Pro
  • Plate 18: Holosun 407K, 507K
  • Plate 21: Trijicon RMRcc

Tall height (1.9″ to 2.2″ scope mounts):

Do not exceed 20-inch lbs of torque on the screws that attach the optic to the plate.


Weight: 1.9 oz without optic.

Length: 1.0″ for the base, which occupies three Picatinny slots (twin recoil lugs and clamping screw).

Height: The base sits 0.180″ above the surface of the Picatinny rail.

The mount is CNC machined from 6061-T6 aluminum and MIL-A-8625 Type III hard coat anodized. IP20 and IP27 Torx Plus bit drivers are included with each base. Made in the USA. Please refer to the instructions below for torque values and mount configuration.


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