SKU: SOMPX01SB
UPC: 699618782288
MPN: MPX-01-SB
The SB Tactical MPX PSB is a pistol stabilizing brace built specifically for the receiver cuts of the SIG SAUER SIG MPX and SIG MCX. It gives shooters running these pistol-caliber platforms a stable, adjustable point of contact that improves control during single-hand and shouldered fire. The MPX PSB ships as a complete assembly, ready to install, with an integral M1913 receiver saddle and an adjustable nylon strap. For owners who want better handling out of a compact 9mm or rifle-caliber pistol without adding bulk, this brace is a direct, purpose-built fit. Browse the rest of our SB Tactical lineup for other platform-specific options.
Construction is synthetic polymer, weighing 19.1 oz per manufacturer specifications. The brace runs a 3-position adjustable length that collapses to 3.875 inches, sits at 6.0 inches mid, and extends to 8.25 inches, with a maximum width of 2.25 inches and a 1.0-inch strap. That adjustment range lets a shooter set length of pull to body size and shooting position. The integral M1913 adjustable housing mates directly to the MPX and MCX receiver, so there's no separate adapter to source. The brace is dual-compatible across both SIG platforms (excluding the SIG MPX Copperhead), designed in the USA by a US veteran. Cheek weld ergonomics are improved over a bare receiver, giving a more consistent index shot to shot.
Owners of SIG MPX and MCX pistols reach for this brace when they want carbine-like stability without converting to an NFA-controlled configuration. It suits home-defense setups, range work, and anyone running a compact PDW-style build where every inch of length matters. Compatibility is built around the SIG receiver cuts, so it is not a universal fit — confirm your variant before ordering, particularly with the Copperhead. If you run an AR or AK platform, our AR-15 stabilizing braces and AK pistol braces cover those receivers with the same SB Tactical engineering.
The MPX PSB is dimensioned to fit the receiver cuts of the SIG SAUER SIG MPX and SIG MCX. It mounts via an integral M1913 receiver saddle and requires no separate adapter. Per manufacturer specifications, the SIG MPX Copperhead variant is excluded; contact SB Tactical directly to confirm Copperhead compatibility.
The brace offers 3 adjustable positions: 3.875 inches collapsed, 6.0 inches at the mid setting, and 8.25 inches fully extended. This range lets shooters tune length of pull to body size and shooting stance for a more consistent cheek index.
Yes. The MPX PSB ships as a complete assembly, ready to install, including the M1913 receiver saddle and an adjustable nylon strap. It mates directly to the SIG receiver, so there is no additional hardware to purchase separately.
The MPX PSB is made of synthetic polymer and weighs 19.1 ounces per manufacturer specifications. It is designed and built in the USA. The polymer construction keeps weight down while maintaining a rigid mounting interface to the receiver.
SB Tactical lists the MPX PSB as a Pistol Stabilizing Brace intended for personal defense weapon builds. Brace regulations have changed over time, so verify the current legal status of stabilizing braces in your jurisdiction before configuring your firearm.
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SB Tactical
