Arisaka Defense Offset Mount Optic Plate – Precision Tactical Accessory for Enhanced Sight Alignment

The Arisaka Defense Offset Mount Optic Plate is a modular red dot mounting solution designed for AR15 shooters who want to run a backup or cowitness optic without sacrificing primary scope performance. This patent-pending system lets you choose between 35- and 45-degree offset positions—giving you flexibility to clear larger turrets on high-magnification scopes or sit closer to more compact glass, all while keeping your red dot zeroed and centered over the bore at lower 1/3 cowitness height. Whether you're setting up a long-range tactical rifle, a competition gun, or a hunting rig with layered optics, this mount adapts to your needs instead of forcing you to compromise.

The engineering here is thoughtful and durable. Arisaka machined the base and plates from 6061-T6 aluminum and finished them with MIL-A-8625 Type III hard coat anodize—the kind of treatment that shrugs off recoil, impacts, and years in the field. The base footprint is compact (1.0" long, sitting 0.180" above your rail), yet it anchors securely with twin recoil lugs and spans three Picatinny slots. At just 1.9 ounces without an optic, it won't bloat your setup. The genius part: base and optic plates are reversible for left or right mounting, and they're sold separately or as a pair, so you can upgrade as your red dot collection grows.

Compatibility is extensive. Arisaka offers standard-height plates (for scope mounts in the 1.5"–1.8" range) and tall-height plates (1.9"–2.2") to mate with everything from Aimpoint Micro and Acro to Trijicon RMR and SRO, Holosun 407C/507C/508T, Leupold Delta Point Pro, SIG Romeo, Swampfox, and more. The plates are sold as a system—you pick the one that fits your optic—so measure twice before ordering. Included: IP20 and IP27 Torx Plus bit drivers for tool-free installation and adjustment.

Key Features

• Selectable 35° or 45° offset angle to clear turrets and large scope bodies
• Reversible design for left or right side mounting
• Lower 1/3 cowitness height maintains optic alignment over bore
• Modular plate system—base and plates sold separately or paired
• 6061-T6 aluminum, MIL-A-8625 Type III hard anodize for durability
• Twin recoil lugs and clamping screw for secure AR15 Picatinny rail fit
• Compact footprint: 1.0" base, 0.180" above rail, 1.9 oz
• Includes IP20 and IP27 Torx Plus drivers

Specifications

Frequently Asked Questions

What red dot sights are compatible with the Arisaka Offset Mount?

Compatibility depends on your scope mount height and which optic plate you select. Standard-height plates (1.5"–1.8" scopes) include mounts for Aimpoint Micro (T1/T2/H1/H2), Trijicon RMR and SRO, Holosun 407C/507C/508T, Leupold Delta Point Pro, SIG Romeo Zero and Romeo 4/5, Swampfox Kingslayer/Sentinel/Liberty/Justice, Docter, Eotech MRDS, Vortex Venom/Viper, Burris Fastfire III, Meopta, Insight, JPoint, and Shield RMS/RMSc. Tall-height plates (1.9"–2.2" scopes) cover the same optics but in taller configurations. Confirm your scope height and optic type before ordering.

Can I use the same mount on the left and right side of my rifle?

Yes. The base and optic plates are reversible, so you can flip the assembly to mount on either the left or right side of your AR15's top rail.

Do I have to buy the base and optic plate together?

No. The base and optic plates are sold separately or as a combination. This modular approach lets you purchase the base once and then add or swap plates as you acquire new red dot sights over time.

What is the difference between the 35° and 45° offset angles?

The 35-degree position brings the red dot sight closer to your primary scope, useful when your scope has a slimmer profile or smaller turrets. The 45-degree position offers greater clearance around larger turrets or high-magnification scopes with wider bodies. You select which angle suits your setup.