SIG Sauer Bringing a Knife to a Gunfight with the New Switchblade

The M400 Switchblade ships as a pistol but is begging for SBR treatment. (Photo: SIG Sauer)

SIG Sauer is expanding its widely popular line of M400 AR-pattern firearms with the new M400 Switchblade, a large-format pistol chambered for 5.56 NATO. The Switchblade is a heavily featured pistol that comes with Magpul’s latest BSL stabilizing brace.

The standout feature of the M400 Switchblade is that it comes standard with fully ambidextrous controls. While many ARs have ambidextrous selectors, charging handles, and sometimes magazine release buttons, the Switchblade also has ambidextrous bolt release levers.

The ambidextrous controls, a premium 2-stage Matchlite Duo Trigger and 11.5-inch taper-profile cold hammer-forged barrel make this a competition-focused pistol, with an M400 Pro free-floating modular M-Lok handguard. A lot of practical-tactical shooting sports implement stages require competitors to shoot both left- and right-handed; using the Switchblade, they’ll have a distinct advantage.

While the M400 Switchblade doesn’t ship with optics, that is also a very personal choice for competitive shooters. Not only do most shooters have preferences when it comes to optics and iron sights, most shooting sports have different classes for different setups, so it’s only natural to leave that up to the shooter.

The pistol is truly ambidextrous with an eye toward hard use and competition sports. (Photo: SIG Sauer)

“The M400 Switchblade brings an entirely new level of performance to the M400 product family with unmatched flexibility and capability,” said SIG’s Tom Taylor. “The pistol features fully ambidextrous controls to include the charging handle, selector, and unique to the Switchblade, the bolt catch and release for seamless transitions from hand to hand and rapid deployment of the catch.

“Additionally, the new Magpul BSL brace offers improved stability, and the rigid handguard is designed to withstand the weight of maximum accessory installation, truly making the M400 Switchblade the ultimate performance pistol,” he added.


  • Overall length: 30 inches
  • Overall height: 7.5 inches
  • Overall width: 2.5 inches
  • Barrel length: 11.5 inches
  • Barrel twist: 1:7 

SEE ALSO: SIG Sauer Expands P320 AXG Series with Classic and Pro Models

The M400 Switchblade ships with a 30-round polymer magazine where available, and comes with SIG’s swept polymer pistol grip, which has a more vertical presentation for shooting with a short length of pull. It measures 30 inches long from the brace to the three-prong flash hider and has a two-tone Cerakote Titanium Elite metallic finish on the alloy handguard and receivers.

The barrel has a 1-in-7 twist for use with longer projectiles, which are often preferred for ARs with shorter barrels. For more information check out SIG Sauer online.

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About the author: Max Slowik is a writer with over a dozen years of experience and is a lifelong shooter. He has unwavering support for the Second Amendment and the human right to self-defense. Like Thomas Paine, he’s a journalist by profession and a propagandist by inclination.

{ 4 comments… add one }
  • Shooter July 16, 2021, 9:22 pm

    So how much will this set you back?

  • stephen lynch July 16, 2021, 6:58 am

    Your lead photo of the Large Format Pistol being fired from the shoulder is all the ammunition the left needs to ban pistol stabilizing braces. Be more mindful of your content in the future.

    • todd July 16, 2021, 9:33 am

      The lead photo is a rifle stock being shouldered. The second photo depicts the pistol brace.

    • Matthew Calcaterra July 16, 2021, 9:37 am

      The lead photo is actually an SBR, not a pistol. Please look closely at the photo, that SBR features a multi-position buffer tube AND Magpul MOE-SL buttstock, NOT a stabilizing brace. Please also note that this photo is courtesy of Sig Sauer, as stared, so I’m certain this is not the first time it has been published.

      Personally, I think it’s a great illustration of the author’s point that this pistol is a perfect candidate for an SBR rifle treatment! Unfortunately, that does require a tax stamp, but I’m sure Sig Sauer followed the rules.

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