Electronic SightsArisaka DefenseSold by Brownells

Arisaka Defense

Offset Optic Mount - Offset Plate, Trijicon Rmrcc 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

No additional components required

Select Either

35-degree or 45-degree offset position

35-degree Position

Places the red dot closer

45-degree Position

Added clearance around wider turrets

Attaches Top

Picatinny rail of an AR15

$25.00
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SKU: 430104538

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 placement without adding extra parts. The 35 degree option positions the optic closer to slimmer scopes, while the 45 degree option leaves more room around wider turrets or larger, higher-magnification optics. Mounted to the top Picatinny rail, it keeps the red dot 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 secondary aiming point on a scoped rifle.

Why Hunters Choose the Arisaka Defense

Modular Design

Lets you choose 35 or

35 Degree

Position sits closer to slimmer,

45 Degree

Position provides added clearance around

Attaches Top

Picatinny rail of an AR15

Maintains Lower

1/3 co-witness height when the

Key Features

  • Modular offset mount for a red dot sight, with no additional components required.
  • Select either a 35-degree or 45-degree offset position.
  • 35-degree position places the red dot closer to slimmer, smaller scopes.
  • 45-degree position provides added clearance around 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 for fast transitions from magnified optics
  • Shooters running slimmer scopes who want the 35-degree offset position
  • Users with wider turrets or larger scopes needing extra clearance at 45 degrees
  • Hunters setting up a canted backup sight while keeping lower 1/3 co-witness height

Specifications

Co Witness HeightLower 1/3
Compatible OpticTrijicon Rmrcc
Mount TypeOffset optic mount
Offset Positions35 degree; 45 degree
Patent PendingYes
Platform CompatibilityAR15 rifle
Rail CompatibilityTop Picatinny rail
Scope Mount Height Range1.9'''' to 2.2''''

Pros

  • Modular design lets you choose 35 or 45 degree offset without extra components.
  • 35 degree position sits closer to slimmer, smaller scopes.
  • 45 degree position provides added 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

  • Provides a 35 or 45 degree offset option, but the choice depends on your scope size and turret clearance rather than a one-position fit for every setup.
  • Designed for attachment to the top Picatinny rail of an AR15 rifle, so it is not a universal mount for other platforms.
  • Intended to keep the optic centered over the bore with a lower 1/3 co-witness height when the rifle is canted, which means it is built around a specific shooting position and sighting setup.
  • Uses a modular design without additional components for angle selection, but that also means compatibility should be checked carefully against the exact red dot and scope combination being used.

Suggested Comparisons

  • Offset red dot optic mounts
  • AR15 Picatinny rail accessories
  • Scope mounting solutions
  • Red dot sight mounting plates

Suggested Accessories

  • Picatinny rail mount
  • Red dot sight
  • Scope

Frequently Asked Questions

What mounting positions does this offset optic mount offer?

It allows the user to select either a 35-degree or 45-degree offset position without needing additional components.

What is this mount designed to attach to?

The mount is designed to attach to the top Picatinny rail of an AR15 rifle.

Why would I choose the 35-degree position instead of the 45-degree position?

According to the product description, the 35-degree position brings the red dot sight closer to slimmer, smaller scopes, while the 45-degree position provides additional clearance around wider turrets or larger, higher magnification scopes.

Does this mount keep the optic centered when the rifle is canted?

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

Is this mount specific to the Trijicon RMRcc?

The product title identifies it as an offset plate for the Trijicon RMRcc, so that is the optic named in the provided data.