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Arisaka Defense
The Arisaka Defense Offset Plate is a modular 1913 Picatinny rail adapter designed to mount a red dot sight at an offset angle on your AR15. This 40-degree offset configuration positions your optic to the side of your rifle's top rail, allowing you to keep a primary scope mounted centrally while running a secondary red dot for close-quarters engagement or rapid target acquisition. Unlike fixed offset mounts, the Arisaka system uses interchangeable plates, so you can upgrade or swap optics without replacing the entire mount—just purchase the plate that matches your specific red dot model.
The modular design means the base stays on your rifle while individual optic plates can be swapped out as your loadout evolves. Whether you're running an Aimpoint Micro, Trijicon RMR, Holosun, SIG Romeo, or any of a dozen other popular red dots, there's a compatible plate. The base and plates can also be reversed, giving you flexibility to mount on either the left or right side of the rail depending on your setup and dominant eye.
Built tough for real use, the mount is CNC machined from 6061-T6 aluminum and hard coat anodized to MIL-A-8625 Type III specs. It weighs just 1.9 ounces, keeping your rifle light and handy. Installation takes minutes—the base clamps across three Picatinny slots with twin recoil lugs and uses included Torx Plus bit drivers for a solid, repeatable zero. At only 1 inch long and sitting just 0.180 inches above the rail, the Arisaka offset plate keeps your setup compact and co-witnessed properly when your rifle is canted to use the red dot.
| Brand | Arisaka Defense |
| Mount Type | 1913 Picatinny Rail Adapter |
| Offset Angle | 40 Degrees |
| Material | 6061-T6 Aluminum |
| Finish | MIL-A-8625 Type III Hard Coat Anodize |
| Weight (Base Only) | 1.9 oz |
| Base Length | 1.0" |
| Base Height Above Rail | 0.180" |
| Picatinny Slots Occupied | 3 (with twin recoil lugs) |
| Included Tools | IP20 and IP27 Torx Plus bit drivers |
Compatibility depends on which individual optic plate you pair with the base. The base is universal; plates are sold separately and designed for specific red dot models. Common compatible sights include Aimpoint Micro, Trijicon RMR, Holosun 407C/507C/508T, SIG Romeo models, Leupold Delta Point Pro, and many others. Check the product listing for your specific red dot model to confirm the correct plate number.
Yes. The base and optic plates are reversible, allowing installation on either the left or right side of the Picatinny rail depending on your preference and shooting style.
The modular design lets you keep the base mounted on your rifle and simply purchase the correct optic plate for your new sight. Plates are sold separately, so you only upgrade the plate, not the entire mount.
When your rifle is canted to align with the offset red dot, the optic remains centered over the bore and maintains a lower 1/3 co-witness height with a properly mounted primary scope.
Arisaka Defense
The Arisaka Defense Offset Plate is a modular 1913 Picatinny rail adapter designed to mount a red dot sight at an offset angle on your AR15. This 40-degree offset configuration positions your optic to the side of your rifle's top rail, allowing you to keep a primary scope mounted centrally while running a secondary red dot for close-quarters engagement or rapid target acquisition. Unlike fixed offset mounts, the Arisaka system uses interchangeable plates, so you can upgrade or swap optics without replacing the entire mount—just purchase the plate that matches your specific red dot model.
The modular design means the base stays on your rifle while individual optic plates can be swapped out as your loadout evolves. Whether you're running an Aimpoint Micro, Trijicon RMR, Holosun, SIG Romeo, or any of a dozen other popular red dots, there's a compatible plate. The base and plates can also be reversed, giving you flexibility to mount on either the left or right side of the rail depending on your setup and dominant eye.
Built tough for real use, the mount is CNC machined from 6061-T6 aluminum and hard coat anodized to MIL-A-8625 Type III specs. It weighs just 1.9 ounces, keeping your rifle light and handy. Installation takes minutes—the base clamps across three Picatinny slots with twin recoil lugs and uses included Torx Plus bit drivers for a solid, repeatable zero. At only 1 inch long and sitting just 0.180 inches above the rail, the Arisaka offset plate keeps your setup compact and co-witnessed properly when your rifle is canted to use the red dot.
| Brand | Arisaka Defense |
| Mount Type | 1913 Picatinny Rail Adapter |
| Offset Angle | 40 Degrees |
| Material | 6061-T6 Aluminum |
| Finish | MIL-A-8625 Type III Hard Coat Anodize |
| Weight (Base Only) | 1.9 oz |
| Base Length | 1.0" |
| Base Height Above Rail | 0.180" |
| Picatinny Slots Occupied | 3 (with twin recoil lugs) |
| Included Tools | IP20 and IP27 Torx Plus bit drivers |
Compatibility depends on which individual optic plate you pair with the base. The base is universal; plates are sold separately and designed for specific red dot models. Common compatible sights include Aimpoint Micro, Trijicon RMR, Holosun 407C/507C/508T, SIG Romeo models, Leupold Delta Point Pro, and many others. Check the product listing for your specific red dot model to confirm the correct plate number.
Yes. The base and optic plates are reversible, allowing installation on either the left or right side of the Picatinny rail depending on your preference and shooting style.
The modular design lets you keep the base mounted on your rifle and simply purchase the correct optic plate for your new sight. Plates are sold separately, so you only upgrade the plate, not the entire mount.
When your rifle is canted to align with the offset red dot, the optic remains centered over the bore and maintains a lower 1/3 co-witness height with a properly mounted primary scope.
