Electronic SightsArisaka DefenseSold by Brownells

Arisaka Defense

Offset Optic Mount - Offset Plate, Holoson 509t For 1.5'''' To 1.8'''' 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-degree or 45-degree offset position

35-degree Setting

Sits closer to slimmer, smaller

45-degree Setting

Adds clearance around wider turrets

Attaches Top

Picatinny rail of an AR15

$25.00
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SKU: 430104529

Overview

This modular offset mount is designed for AR15 rifles and gives the shooter a choice of 35 or 45 degree red dot placement without needing extra components. The 35 degree setting places the optic closer to slimmer scopes, while the 45 degree setting adds clearance for wider turrets or larger magnified optics. When the rifle is canted to use the offset sight, the optic stays centered over the bore and maintains a lower 1/3 co-witness height. It is a practical setup for hunters and shooters who want a streamlined transition option on a top Picatinny rail.

Why Hunters Choose the Arisaka Defense

Modular Design

Lets you choose 35 or

35 Degree

Position places the red dot

45 Degree

Position adds clearance around wider

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-degree or 45-degree offset position.
  • 35-degree setting sits closer to slimmer, smaller scopes.
  • 45-degree setting adds 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

  • AR-15 users mounting a red dot sight alongside a smaller scope on the top Picatinny rail.
  • Shooters needing a 35-degree offset position for closer placement around slimmer optics.
  • Users wanting a 45-degree offset position for extra clearance around wider turrets or larger scopes.
  • Hunters or rifle users who prefer a canted backup sighting option with lower 1/3 co-witness height.

Specifications

Co Witness HeightLower 1/3
CompatibilityHoloson 509t
Mount TypeOffset optic mount
Offset Positions35 degree; 45 degree
Patent PendingYes
PlatformAR15 rifle
Rail InterfaceTop Picatinny rail
Scope Mount Range1.5'''' to 1.8''''

Pros

  • Modular design lets you choose 35 or 45 degree offset without extra components.
  • 35 degree position places the red dot closer to slimmer, smaller scopes.
  • 45 degree position adds clearance around wider turrets and larger magnified 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

  • Offers a choice of 35 or 45 degree offset positions, so the setup needs to be matched to the scope size and turret clearance you’re working around.
  • Designed for top Picatinny rail use on an AR15 rifle, so it is platform-specific rather than a universal mounting solution.
  • Intended to maintain a lower 1/3 co-witness height when the rifle is canted, which may not suit users looking for a different sight picture.
  • The product description does not include all compatibility details for the red dot sight or scope setup, so fit should be verified before purchase.

Suggested Comparisons

  • AR-15 optic mounting accessories
  • Offset red dot sight mounts
  • Picatinny rail optic mounts
  • Red dot sight mounting plates

Suggested Accessories

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

Frequently Asked Questions

What mounting positions does this offset optic mount support?

It allows the user to select either a 35-degree or 45-degree offset position for a red dot sight 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.

When would I choose the 35-degree position versus the 45-degree position?

The 35-degree position brings the red dot sight closer to slimmer, smaller scopes. 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 product 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 sold as a complete optic setup?

No. Based on the provided description, this is an offset optic mount/base for a red dot sight. The source does not list included optic models or any additional components.