SB Tactical MPX PSB 3-Position Pistol Brace Black for SIG MPX/MCX

Description

The SB Tactical MPX PSB is built specifically for the SIG SAUER MPX and MCX, dropping into the receiver cuts these platforms already have from the factory. Instead of a bulky adapter, you get a purpose-made brace with an integral M1913 receiver saddle that locks in tight and keeps the whole package compact. It arrives as a complete assembly, ready to install, which means less fiddling and more range time.

What the MPX PSB Brings to Your Build

The standout here is the three-position adjustment. You can run it collapsed at 3.875 inches for a short, handy setup, stretch it out to 8.25 inches for a longer reach, or split the difference at 6 inches. That range lets you match the length to your body, your gear, and how you shoot. Owners consistently mention the solid lock-up in both the stowed and extended positions, so it stays put once you set it. The adjustable nylon strap secures the brace to your forearm, giving you that stabilizing third point of contact that improves control and helps tame recoil.

Fit and Build of the MPX PSB

The body is molded from durable elasto-polymer with steel hardware where it counts, finished in a clean matte black that blends right in with the MPX and MCX aesthetic. At 2.25 inches wide with a 1-inch strap, it keeps a slim profile that a lot of people compare to the classic MP5-style look when the brace is stowed. Total weight comes in around 19.1 ounces.

One thing worth knowing before you order: this brace fits genuine SIG MPX and MCX receivers, but it does not fit the MPX Copperhead, and MCX users need a genuine SIG MCX lower receiver rather than a stock adapter kit. If you're running a standard MPX or MCX and want a compact, well-built brace that goes on without drama, the MPX PSB is one of the most refined options made for the platform.