Arisaka Defense Offset Plate, Sig Romeo 1/ 1 Pro For 1.5'' - 1.8'' Scope Mount

The Arisaka Defense Offset Plate for Sig Romeo 1/1 Pro is a modular mounting solution built for shooters who run a magnified optic on top and want to add a secondary red dot sight without the hassle of switching out components. Designed specifically for 1.5" to 1.8" scope mounts, this offset plate lets you mount your Sig Romeo sight at an angle—either 35 or 45 degrees—so it sits clear of your scope turrets and still stays zeroed to your bore when canted into use. It's the kind of practical two-gun system that makes sense for hunting, competition, or carbine work where you want both close-range and precision aiming options.

What makes Arisaka's approach smart is modularity. The base and optic plates are reversible, so you can run the sight on your dominant or support side depending on your setup. If you later swap to a different red dot, you don't have to replace the entire mount—just grab the correct plate for that optic and you're done. The offset positioning is the real value here: a 35-degree angle brings your dot closer to slimmer, smaller scopes, while the 45-degree setup gives you clearance around chunkier turrets and higher-magnification glass. Either way, your sight maintains a lower 1/3 co-witness height, keeping you on target without fighting the scope.

Built from 6061-T6 aluminum with MIL-A-8625 Type III hard coat anodizing, this mount is CNC machined to Arisaka's usual tight tolerances. It weighs just 1.9 oz (optic not included) and seats on the top Picatinny rail of your AR15 using three slots with twin recoil lugs and a clamping screw. The base stands 0.180" above the rail, keeping your height of eye reasonable. You'll get the Torx Plus bit drivers needed for installation.

Key Features

• Modular design—select 35 or 45 degree offset without additional parts
• Reversible base and plates for left or right side mounting
• Maintains lower 1/3 co-witness height when optic is canted
• 6061-T6 aluminum, hard coat anodized for durability
• Lightweight at 1.9 oz (without optic)
• Picatinny rail mount with twin recoil lugs and clamping screw
• Torx Plus drivers included
• Individual plates available for future upgrades

Specifications

Frequently Asked Questions

What scopes work with this offset plate mount?

This Arisaka offset plate is designed for scope mounts in the 1.5" to 1.8" standard height range. If you have a taller scope mount (1.9" to 2.2"), Arisaka makes a separate tall-height version. Your existing scope mount diameter and height determine compatibility.

Can I switch between 35 and 45 degree offset positions?

Yes. The offset angle is selectable without requiring additional components—you can choose 35 degrees (for slimmer, smaller scopes) or 45 degrees (for wider turrets or high-magnification optics) based on your needs.

Can I use this on the left or right side of my rifle?

Yes. The base and optic plates are reversible, so you can mount the Sig Romeo sight on your dominant or support side depending on your setup.

Will I need to replace this mount if I get a different red dot sight later?

Not necessarily. The base and optic plates can be purchased separately, so you can upgrade to a different Sig Romeo or compatible optic and keep the base in place, upgrading only the plate to match your new sight.