Description
Running a magnified scope is great until a target pops up close and personal. That's exactly the gap the Primary Arms SLx Offset Reflex Mount is built to close. It connects to your SLx 30mm or 34mm one-piece scope mount and acts as a built-in host for a mini reflex sight, giving you a fast close-quarters option without pulling your main optic off the rifle.
How the SLx Offset Reflex Mount Works
The mount sits at a 32.5-degree angle offset, so a slight roll of the rifle brings your red dot right into view. That positioning keeps your primary scope centered and untouched while your reflex sight rides along the side, ready when you need speed over magnification. It's a clean, purpose-built setup for anyone who wants a two-optic solution on a single rail without stacking a bunch of aftermarket parts together.
Optic Compatibility and Adapter Plates
This is where the Offset Reflex Mount earns its keep. It uses GLOCK MOS pattern adapter plates, which opens the door to a huge range of mini reflex sights and footprints. Whether you're running a Holosun, a Trijicon, or another popular micro dot, you just grab the matching MOS plate and you're set. Keep in mind you'll need the correct MOS plate for your specific optic, and the plate is sold separately from the mount itself.
Build and Fit
Machined from 6061 aluminum with a black hardcoat anodized finish, this mount holds up to real range and field use while keeping things corrosion resistant. It weighs in at just 1.485 ounces, so it barely registers on your build. Like the rest of the Primary Arms factory risers and mounting hardware, it's backed by the Primary Arms lifetime warranty, which is a nice bit of peace of mind for a part that lives on your rifle for the long haul.
Key Specifications
- Manufacturer: Primary Arms
- Manufacturer Part Number: 910099
- UPC: 818500019565
- Offset Angle: 32.5 degrees
- Compatibility: SLx 30mm and 34mm one-piece scope mounts
- Optic Footprint: GLOCK MOS pattern adapter plates
- Material: 6061 Aluminum
- Finish: Black hardcoat anodized
- Weight: 1.485 oz
- Warranty: Primary Arms Lifetime Warranty
What’s Included
- Primary Arms SLx Offset Reflex Mount (910099)
- Mounting hardware
Frequently Asked Questions
What scope mounts does the SLx Offset Reflex Mount work with?
It's designed to connect directly to Primary Arms SLx 30mm and 34mm one-piece scope mounts. It attaches to the mount itself rather than the rail, which is what keeps your primary optic in place and your reflex sight riding off to the side. If you're running one of those SLx one-piece mounts, this is a plug-and-play addition.
Does the Offset Reflex Mount come with an adapter plate for my red dot?
No, the MOS adapter plate is sold separately. The mount uses the GLOCK MOS footprint, so you'll pick the plate that matches your specific mini reflex sight. For example, a Holosun 507C typically uses the MOS #2 plate, so check your optic's recommended plate before ordering.
What angle is the offset on this mount?
The mount is set at a 32.5-degree offset. That angle lets you roll the rifle slightly to pick up your red dot for close-range shots while keeping your magnified optic level and ready. It's a comfortable, natural transition once you get used to the movement.
Is the SLx Offset Reflex Mount durable enough for hard use?
Yes, it's machined from 6061 aluminum with a black hardcoat anodized finish for corrosion resistance and long-term wear. It carries the same build quality as the rest of the Primary Arms factory mounting gear and is backed by the Primary Arms lifetime warranty. At just under 1.5 ounces, it adds strength without adding noticeable weight.





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