4 Best Sig MPX Pistol Braces

Here are the 4 best Sig MPX pistol braces based on design, overall aesthetics, durability, and price. These will include proprietary designs as well as adapter mounted

*Be sure to check your local state law before buying a pistol brace

Note: As of May 2022, On June 7, 2021, the Attorney General signed ATF proposed rule 2021R-08, “Factoring Criteria for Firearms with Attached 'Stabilizing Braces,'” amending ATF's regulations to clarify when a rifle is “intended to be fired from the shoulder.”

SB Tactical PSB

sb tactical psb mpx brace
sig mpx pistol brace

The PSB MPX pistol brace is the best collapsing brace for Sig MPX. It comes as a complete assembly, ready-to-install on the MPX receiver.

Adjustable Position - Change length of pull to your preferred configuration

Good Aesthetics - Bad ass PDW aesthetics without looking looking strange like other braces

SB Tactical SBA3

SB tactical sba3 brace

SB Tactical SBA3 is by far the hottest selling AR15 pistol brace, and it works on SIG MPX that features a buffer tube assembly.

Adjustable Position - Change length of pull to your preferred configuration

Good Aesthetics - The SBA3 looks and feel like a First Tactical low drag stock that look great on most AR15 pistol builds

Easy Install - Fits any 6 Position Mil-Spec buffer tube (When ready to SBR your AR, just replace the brace with a stock without messing with the buffer tube)

a3 tactical folding brace

A3 tactical MPX folding brace ranks number 3 on our list for its slick look and durability. This one makes storing, transporting your MPX pistol much easier.

Ultra Compact - Fold the brace to free up room

Lightweight - Skeletonized design keeps the overall MPX weight super light.

Better Vehicle & Tight Space Maneuverability - Less burden when operating in and out of tight spaces

Quick Deployment Latch - Simply swing the brace open and lock it in place

gear head works tail hooks

The Tailhook is a ATF approved pistol brace design that uses a rigid foldout support arm design to counterbalance muzzle weight to stabilize an MPX pistol against the shooter’s forearm. 

The Tailhook pistol braces are much easier to operate than other braces on the market because it's easier to wrap it around the forearm.

Proprietary Buffer Tube - Required

Greater Flexibility - Adjust the brace on the fly to different shooters.

Works On Other Pistol Builds - Billet machined design work on other pistol variants with buffer tube as well


Are Pistol Braces Legal ?

As of 2022, pistol stabilizing braces are legal to configure a pistol.

In June 2021, the ATF redefined rifles by specifically excluding AR pistols and braces from the definition. Instead, this newly-proposed definition would move braced-AR pistols out of the pistol category and into the NFA-restricted short-barrel rifle realm 

Can You Shoulder The Brace Like A Rifle?

Yes, you can shoulder an PCC pistol fitted with a stabilizing brace, and please do not modify the brace. However, the specific wording uses the terms “incidental, sporadic, or situational use.”

The ATF’s interprets the law that you’re legally allowed to shoulder, but they also obscurely discourage the practice.

The part of the definition “in its original approved configuration” suggests that it is only legal so long as the brace is not modified or improved for use as a shoulder stock. 

Removing the adjustment straps may constitute “redesigning” the brace into a stock, converting your MPX pistol into an Short Barrel Rifle (SBR)

Should You Shoulder The Pistol While Zeroing The Optic?

The best way is to stabilize the firearm is to apply good shooting fundamentals. It's up to your judgement.

*It doesn't make sense to zero a firearm without multiple points of contact to stabilize.