Arisaka Offset Optic Mount PLT 14 - 509 Tall | Precision Tactical Accessory for Enhanced Target Acquisition

The Arisaka Offset Optic Mount PLT 14 - 509 Tall is a modular red dot mounting solution designed for AR15 rifles that already wear a primary scope. This tactical accessory lets you run an offset red dot sight—either 35 or 45 degrees—while keeping your primary optic in the center position. The 35-degree angle works best with slimmer, smaller scopes; the 45-degree angle gives you clearance around wider turrets and larger, higher-magnification glass. Either way, when you cant the rifle to use the offset dot, it stays centered over the bore and holds a lower 1/3 co-witness height, giving you reliable aim without complicated holdovers.

Build quality is serious: the mount is CNC machined from 6061-T6 aluminum and finished with mil-spec hard anodize (MIL-A-8625 Type III), so it'll handle the recoil and weather. The base clamps to your top Picatinny rail using twin recoil lugs and a clamping screw—occupies three slots and sits just 0.180" above the rail. The whole base weighs only 1.9 oz without an optic mounted, keeping your rifle lean. Both the base and optic plates are reversible, so you can switch between left and right side mounting as your setup demands.

This is a platform, not a one-shot solution. You buy the base once, then select individual optic plates as you acquire different red dots—upgrade path built in. Torx Plus bit drivers (IP20 and IP27) are included with the base. The "509 Tall" variant is cut for scope mounts in the 1.9" to 2.2" height range, giving you co-witness options with a wider variety of primary scopes.

Key Features

• Two offset angles (35° and 45°) in one mount—select the position that clears your primary optic
• Reversible plates for left- or right-side operation
• Lower 1/3 co-witness height maintains bore alignment when canted
• Modular design: base and plates sold separately or as a package for easy future upgrades
• CNC machined 6061-T6 aluminum with mil-spec hard anodize finish
• Weighs just 1.9 oz (base only)
• Includes Torx Plus bit drivers for installation and adjustment

Specifications

Frequently Asked Questions

What red dot sights work with the Arisaka Offset Optic Mount PLT 14 - 509 Tall?

The tall variant is cut for a range of popular optics, including Trijicon RMR, Holosun 407C/507C/508T, Aimpoint Micro series (T1, T2, H1, H2), SIG Romeo 4 and 5, Leupold Delta Point Pro, Shield RMS/RMSc, Swampfox Sentinel, Aimpoint Acro, and many others. Check the compatibility list on the product specifications to confirm your red dot sight matches an available plate.

Can I use this mount on the left side of my rifle?

Yes. The base and optic plates are reversible, allowing you to mount the offset dot on either the left or right side of your rifle depending on your shooting preference or your primary scope configuration.

Which offset angle should I choose—35 or 45 degrees?

The 35-degree angle sits closer to the bore and works best with slimmer, smaller primary scopes. The 45-degree angle provides additional clearance around wider turrets or larger, higher-magnification scopes. Choose based on your primary optic's footprint.

Do I need to buy the base and plates together, or can I upgrade later?

The base and optic plates are sold separately or as a combination package. You can purchase just the base now and add different plates as you acquire new red dot sights down the road, making this mount a long-term platform investment.