First Look: Primary Arms SLx 3x Magnifier And Mount

Primary Arms Optics is releasing the brand-new SLx 3x MFS magnifier.

posted on March 12, 2022
Primary Arms Slx3 Magnifier

The new SLx 3x MFS magnifier from Primary Arms augments your red dot or 1x MicroPrism with added magnification that enhances performance when engaging targets at medium or long distances. The SLx 3x MFS is part of Primary Arms' SLx optics line, which built their reputation for innovation, reliability, and value. All SLx optics undergo rigorous field-testing during development to best serve you in any environment.

“With the success of our SLx 1x MicroPrism and MD-25 Red Dot, we wanted to expand our catalog with a supplemental magnifier that helps users get the most from their CQB optics,” says Stephen Morgan, Director of Product Marketing at Primary Arms Optics. “The SLx 3x MFS improves on our past magnifier designs with all-new materials and engineering, making it easier to spot and engage your targets at mid- to long-range. When paired with our new FTSM-B mount, it makes for a remarkably versatile optics combo, expanding the capability of any rifle setup.”

The SLx 3x MFS is compatible with most popular 2-screw magnifier mounts and is a versatile addition to any close-quarters optics setup. The enhanced glass quality and wide field-of-view ensure that the user can always get a clear view of their target. Although the SLx 3x MFS weighs a just 8.6 ounces, it has a durable construction that protects it against repeated shocks and impacts of high-intensity use. The SLx 3x MFS comes backed with a limited lifetime warranty and Primary Arms' commitment to customer satisfaction.

The SLx 3x MFS is sold standalone without a mount, which reduces the price for customers that already own an aftermarket mount. For customers who do not yet have a mount, or for those looking to make an upgrade, Primary Arms Optics has also released their new button-lock Flip-to-Side Mount (FTSM-B), which fits perfectly with the new SLx 3x MFS magnifier to place the center of the magnifier at absolute or lower 1/3rd co-witness height

MSRP for the SLx 3x MFS is $149.95, and the MSRP for the Flip-to-Side Mount is $59.99. For more information on this optic or other products from Primary Arms, please visit



Apex Tactical Mark IV Trigger.
Apex Tactical Mark IV Trigger.

First Look: Apex Competition Trigger Kit for Ruger Mk IV Pistol

Take your 22LR Mark IV to the next level with a new trigger.

First Look: Marlin Model 1895 Trapper Lever Action Rifle

The power of the .45-70 Government cartridge with the classic good looks of a lever action rifle.

First Look: Beretta APX A1 FS

Trigger improvements, a new slide and out-of-the-box red dot compatibility as just a few of the updated features.

Gunsite Honors Wiley Clapp

A classroom at Gunsite will be be named after the long-time Shooting Illustrated contributor and columnist.

First Look: SnapSafe In-Wall Safes

Securely store your valuables away from prying eyes with these two new safes.

First Look: Hogue K320 AXG Knives

A new lineup of knives from Hogue that match the good looks and features of your AXG grip module.


Get the best of Shooting Illustrated delivered to your inbox.