Rings, Mounts & BasesArisaka DefenseSold by Brownells

Arisaka Defense

Offset Optic Mount - Offset Optic Mount Base Only

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

Modular Offset

No additional components required for

Selectable 35-degree

45-degree offset positions to match

35-degree Position

Places the red dot closer

45-degree Position

Added clearance around wider turrets

Designed Attach

To the top Picatinny rail

$100.00
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SKU: 100040405

Overview

Built for AR15 setups that pair a primary scope with a red dot sight, this modular mount gives the shooter a choice of 35 or 45 degree offset positioning without adding extra components. The 35 degree option places the optic closer to slimmer, smaller scopes, while the 45 degree option offers more room around wider turrets or larger, higher-magnification optics. Mounted to the top Picatinny rail, it is intended to keep the offset sight centered over the bore and at a lower 1/3 co-witness height when the rifle is canted. It is a practical base for hunters and shooters who want a streamlined transition to a secondary aiming point on an AR platform.

Why Hunters Choose the Arisaka Defense

Selects Either

35 or 45 degree offset

35 Degree

Position sits closer to slimmer,

45 Degree

Position adds clearance around wider

Attachment Top

Picatinny rail of an AR15

Keeps Optic

Centered over the bore when

Key Features

  • Modular offset mount for a red dot sight, with no additional components required for setup.
  • Selectable 35-degree or 45-degree offset positions to match different optic and scope configurations.
  • 35-degree position places the red dot closer to slimmer, smaller scopes.
  • 45-degree position provides added clearance around wider turrets or larger, higher-magnification scopes.
  • Designed to attach to the top Picatinny rail of an AR15 rifle.
  • Maintains a centered-over-bore optic position and lower 1/3 co-witness height when canted.

Best Used For

  • AR15 users mounting a red dot alongside a slimmer, smaller scope on top rail
  • Shooters needing a 35-degree offset position for closer placement to compact optics
  • Users running wider turrets or larger magnification scopes who need 45-degree clearance
  • Hunters and shooters wanting a canted red dot setup that keeps lower 1/3 co-witness height

Specifications

Base OnlyYes
Co Witness HeightLower 1/3 co-witness
CompatibilityAR15 rifle
ModularYes
Mount TypeOffset optic mount
Offset Positions35 degree; 45 degree
Rail InterfaceTop Picatinny rail
Requires Additional ComponentsNo

Pros

  • Selects either 35 or 45 degree offset without additional components
  • 35 degree position sits closer to slimmer, smaller scopes
  • 45 degree position adds clearance around wider turrets and larger scopes
  • Designed for attachment to the top Picatinny rail of an AR15 rifle
  • Keeps the optic centered over the bore when the rifle is canted
  • Maintains a lower 1/3 co-witness height

Considerations & Trade-offs

  • This is a base-only mount, so a compatible red dot sight and any needed optic-specific components are not included.
  • It is designed for attachment to the top Picatinny rail of an AR15 rifle, so it is not a universal mounting solution for other platforms.
  • The 35 degree setting is intended to sit closer to slimmer, smaller scopes, while the 45 degree setting provides more clearance around wider turrets or larger, higher magnification scopes; the right choice depends on your optic setup.
  • Use requires canting the rifle to access the offset sight, which is a different manual of operation than a primary top-mounted optic.

Suggested Comparisons

  • AR15 optic mounts
  • Offset red dot sight mounts
  • Picatinny rail accessories
  • Modular optic mounting systems

Suggested Accessories

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

Frequently Asked Questions

What does this mount include?

This is the Offset Optic Mount Base Only. The provided description identifies it as a modular mounting solution, but it does not list any additional included components.

What angle options does the mount offer?

The mount allows the user to select either a 35-degree or 45-degree offset position for a red dot sight without requiring additional components.

What is the difference between the 35-degree and 45-degree positions?

According to the 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.

What rifles is this mount designed for?

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

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

Yes. The description says 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.