Primary Arms SLx Flip-to-Side Magnifier Mount

The Primary Arms SLx Flip-to-Side Magnifier Mount holds your magnifier behind your optic and swings it out of the way when you don't want it. That's the job, and this one does it with a couple of smart design choices. It uses a direct 2-bolt interface that bolts the magnifier straight to the mount instead of clamping it in a traditional ring. That saves weight, adds strength, and removes any chance of the magnifier slipping or rotating in the mount, which is the failure a ring-style mount can have.

Height matching is where it earns its keep. It sets your magnifier at a 1.41" optical centerline out of the box, and it includes spacers that raise it to 1.535" or 1.64", so you can line the magnifier up precisely with whatever height your optic sits at. That flexibility isn't advertised loudly enough, if you're running an optic on a riser or a taller-than-standard mount, the included spacers likely have you covered without buying anything extra.

It's machined from 6061-T6 aluminum with a hardcoat anodized finish and locks down with two steel alloy crossbolts torqued to 55 in-lbs, so it stays put. The flip action is positive and easy to work one-handed, and the whole thing weighs 2.5 oz. It comes with the bolts and thread locker you need.

One practical tip: use the included blue thread locker on the magnifier bolts. Shooters who skip it report the screws backing out after a few dozen rounds. It takes ten seconds and saves you a headache at the range.

This mount fits Primary Arms 2-bolt magnifiers, including the SLx 3x Micro Magnifier. Note the magnifier is sold separately. Browse the rest of our optics and mounts here.

Matching Your Optic Height

Getting the magnifier centerline to match your optic's centerline is what gives you a clean, centered sight picture. This mount starts at 1.41" and includes spacers for 1.535" and 1.64". If your optic sits at one of those heights, you're set. If you're running an optic at a taller 1.93" height, Primary Arms makes a separate 1.93" riser version of this mount. Measure your optic's centerline before ordering.

What It Pairs With

It's built for Primary Arms 2-bolt magnifiers like the SLx 3x Micro Magnifier. Behind a red dot like the Sig Romeo 5 Gen 2, Romeo MSR Gen 2, or Holosun ARO, it gives you a magnified option on demand and a clean 1x sight picture the moment you flip it aside.

Key Features

• Direct 2-bolt interface. Bolts the magnifier on, no rings, no slipping or twisting.
• 1.41" centerline. Plus included spacers for 1.535" and 1.64" heights.
• Dual steel crossbolts. Torque to 55 in-lbs for a rock-solid lockup.
• Positive flip action. Easy to operate one-handed.
• Low profile and light. 6061-T6 aluminum, hardcoat anodized, 2.5 oz.
• Hardware included. Bolts and thread locker in the box.

Specs

• Type: Flip-to-side magnifier mount
• Interface: Primary Arms 2-bolt direct-mount magnifiers
• Optical centerline: 1.41" standard; spacers included for 1.535" and 1.64"
• Material: 6061-T6 aluminum
• Finish: Hardcoat anodized, black
• Crossbolts: Two, steel alloy, 55 in-lbs torque
• Rail: MIL-STD-1913 Picatinny
• Weight: 2.5 oz
• Included: Spacers, bolts, thread locker

FAQ

What magnifiers fit this mount?
Primary Arms 2-bolt direct-mount magnifiers, including the SLx 3x Micro Magnifier. It uses a bolt-on interface rather than a ring, so it won't fit magnifiers designed for ring-style mounts.

Does it come with the magnifier?
No, the magnifier is sold separately. This is the mount only, though it does include the spacers, bolts, and thread locker you'll need to install a compatible magnifier.

How do I match it to my optic's height?
It sets a 1.41" centerline by default, and the included spacers raise it to 1.535" or 1.64". Measure your optic's centerline height and use the spacer that matches. For 1.93" optics, Primary Arms makes a separate 1.93" riser version.

Do I really need the thread locker?
Yes, use it. Shooters who skip the included blue thread locker report the magnifier bolts backing out after a few dozen rounds. It comes in the box for a reason.

Why a bolt-on interface instead of rings?
Bolting the magnifier directly to the mount saves weight, increases strength, and eliminates the possibility of the magnifier slipping or rotating in a ring, which is a known weak point of traditional ring mounts.