Electronic SightsArisaka DefenseSold by Brownells

Arisaka Defense

Offset Optic Mount - Offset Plate, Trijicon Mro For 1.9'''' To 2.2'''' Scope Mount

Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.

Modular Offset

Optic mount for a red

Selects Either

35 or 45 degree offset

35 Degree

Setting sits closer to slimmer,

45 Degree

Setting adds clearance for wider

Attaches Top

Picatinny rail of an AR15

$25.00
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SKU: 430104536

Overview

This modular offset optic mount is built for AR15 setups that pair a red dot with a primary scope, giving the shooter a choice of 35 or 45 degree positioning without adding extra components. The 35 degree option sits closer to slimmer, smaller scopes, while the 45 degree option offers more clearance around wider turrets or larger, higher-magnification optics. Mounted to the top Picatinny rail, it keeps the offset optic centered over the bore when the rifle is canted and maintains a lower 1/3 co-witness height. It is a practical fit for hunters and shooters who want a streamlined transition to a close-range aiming option on a scoped rifle.

Why Hunters Choose the Arisaka Defense

Modular Design

Lets users choose 35 or

35 Degree

Option positions the red dot

45 Degree

Option provides additional clearance around

Attaches Top

Picatinny rail of an AR15

Maintains Lower

1/3 co-witness height when the

Key Features

  • Modular offset optic mount for a red dot sight
  • Selects either 35 or 45 degree offset position
  • 35 degree setting sits closer to slimmer, smaller scopes
  • 45 degree setting adds clearance for wider turrets or larger scopes
  • Attaches to the top Picatinny rail of an AR15 rifle
  • Maintains lower 1/3 co-witness height when the rifle is canted

Best Used For

  • AR15 users mounting a red dot alongside a slimmer, smaller scope on top rail
  • Shooters needing a 35-degree offset option for closer optic placement
  • Rifles with wider turrets or larger scopes requiring 45-degree clearance
  • Hunters wanting a canted backup sight while maintaining lower 1/3 co-witness height

Pros

  • Modular design lets users choose 35 or 45 degree offset positions without extra components.
  • 35 degree option positions the red dot closer to slimmer, smaller scopes.
  • 45 degree option provides additional clearance around wider turrets and larger scopes.
  • Attaches to the top Picatinny rail of an AR15 rifle.
  • Maintains a lower 1/3 co-witness height when the rifle is canted.

Considerations & Trade-offs

  • This mount is designed for an AR15 top Picatinny rail, so it is not a universal solution for other platforms or rail setups.
  • The 35 degree and 45 degree positions serve different optic-clearance needs, so the best fit depends on the scope profile and turret size you are pairing it with.
  • It is intended for use with a canted rifle position and a lower 1/3 co-witness height, which may not match every shooter’s preferred sight picture or setup.
  • The product is an offset plate for a Trijicon MRO configuration, so compatibility should be confirmed against the specific optic and mount arrangement before purchase.

Suggested Comparisons

  • Offset optic mount
  • Red dot sight mount
  • Picatinny rail accessory
  • AR15 optic mounting solution

Suggested Accessories

  • Picatinny rail mount
  • Red dot sight
  • Scope mount
  • AR15 accessory

Frequently Asked Questions

What does the Arisaka Offset Optic Mount do on an AR15?

It is a modular mounting solution for attaching an offset red dot sight to the top Picatinny rail of an AR15 rifle.

Can the offset position be changed without extra parts?

Yes. The product description says it allows the user to select either a 35 or 45 degree offset position without requiring additional components.

When would the 35 degree position be useful?

The 35 degree position is described as bringing the red dot sight closer to slimmer, smaller scopes.

When would the 45 degree position be useful?

The 45 degree position is described as providing additional clearance around wider turrets or larger, higher magnification scopes.

What sight height does it maintain when the rifle is canted?

The description says the optic remains centered over the bore and maintains a lower 1/3 co-witness height when the rifle is canted to use the offset red dot sight.