Primary Arms SLx Flip-To-Side Magnifier Mount PA-SLX-FTSM (also known as the SLx FTSM 2-Bolt Interface Magnifier Mount).
This is a low-profile, direct-bolt flip-to-side magnifier mount designed specifically for Primary Arms SLx magnifiers (including the popular Micro 3x) and other compatible 2-bolt interface magnifiers. It allows quick, one-handed flipping of the magnifier out of the way for unobstructed red dot or 1x prism use, then back into alignment for extended range. The mount uses a robust direct-bolt system (no rings) to reduce weight, increase rigidity, and eliminate slippage or twisting.
Key Features & Specs
- Mount Height: Standard optical centerline of 1.41 inches above the Picatinny rail. Includes spacers for adjustable heights of 1.535 inches and 1.64 inches to help achieve proper alignment/co-witness with your primary optic (red dot or MicroPrism).
- Compatibility: Direct 2-bolt bottom interface for SLx magnifiers and most other 2-bolt pattern magnifiers. Works behind Primary Arms red dots, SLx 1x MicroPrisms, and many third-party red dots/prisms. A separate 1.93" riser/spacer is available for use with taller 1.93" height red dots.
- Construction: 6061-T6 aluminum body with hardcoat anodized black finish. Two steel alloy crossbolts that torque up to 55 in-lbs for a rock-solid, repeatable lockup. Low-profile design keeps added bulk minimal.
- Operation: Smooth flip-to-side mechanism for fast transitions between magnified and unmagnified views. Direct bolt-on interface (instead of rings) saves weight and improves strength.
- Size & Weight: Extremely lightweight — approximately 2–2.5 oz (depending on spacers used). Keeps your setup agile.
- Additional: Includes necessary hardware and spacers. Lifetime warranty from Primary Arms. Made for rugged AR-15, carbine, PCC, and tactical use.
The PA-SLX-FTSM excels at providing repeatable alignment and quick deployment without adding noticeable weight or length. It pairs especially well with the SLx Micro 3x Magnifier (black or FDE) for a compact magnified setup. Users praise its solid lockup, easy height adjustments via spacers, and overall value. A push-button variant (different SKU) exists for even faster one-handed operation, but the standard FTSM is the core model.
Note: This mount does not include the magnifier itself — it is sold separately. For taller 1.93" red dot setups, add the dedicated 1.93" riser (sold separately).
Who It's For
- AR-15/carbine builders running a red dot + magnifier combo who want quick flip-to-side functionality.
- Users of Primary Arms SLx Micro 3x Magnifier or similar 2-bolt magnifiers.
- Anyone prioritizing low weight, strength, and adjustable height for proper co-witness/alignment.
