The SB Tactical MPX PSB is a 3-position adjustable pistol stabilizing brace engineered specifically for the SIG SAUER MPX and MCX platform. Built as a complete ready-to-install assembly with an integral M1913 receiver saddle, this brace gives you a rock-solid platform whether you're running drills at the range or testing your setup in the field. It's designed by a US veteran and made in the USA — the kind of attention to detail that matters when you're betting on your gear.

The real strength here is versatility: three adjustable positions let you dial in the fit that works best for your grip style and shooting situation. The quick-detach arrangement ships complete with an adjustable nylon strap, so you're not hunting down compatibility parts or waiting for extras. That said, MCX shooters need to know upfront — you'll need a genuine SIG MCX lower receiver for compatibility, and the stock adapter kit isn't going to play nice with this brace.

At just under 20 ounces and finished in black, the MPX PSB slots into a SIG platform without adding dead weight or bulk. Whether you're a dedicated MPX enthusiast or running a modular MCX setup, this is a brace built for the specific geometry of your gun, not a compromise fit.

Key Features

• 3-position adjustable design for custom fit and comfort
• Dual compatibility with SIG MPX and SIG MCX platforms
• Complete assembly ships ready-to-install with M1913 receiver saddle
• Integral adjustable nylon strap included
• Made in the USA by a veteran-owned company
• Lightweight at 19.1 ounces

Specifications

Fit	SIG MPX / SIG MCX
Length (adjustable positions)	3.875", 6.0", 8.25" overall
Maximum width	2.25"
Strap width	1.0"
Weight	19.1 ounces
Color	Black

Frequently Asked Questions

Will this brace fit my SIG MCX?

Yes, the MPX PSB is dimensioned for both MPX and MCX platforms. However, MCX owners must use a genuine SIG MCX lower receiver and cannot use the SIG MCX Stock Adapter Kit with this brace.

Is this brace compatible with the SIG MPX Copperhead?

No — the MPX PSB is not compatible with the SIG MPX Copperhead variant.

What comes in the box?

The MPX PSB ships as a complete assembly, ready to install. You'll receive the brace itself with an integral M1913 adjustable receiver saddle and an adjustable nylon strap. No additional parts are needed for installation.

How much length adjustment does this offer?

The three positions provide overall lengths of 3.875", 6.0", and 8.25", giving you flexibility to dial in the fit that works best for your shooting style.