The Switchblade: SIG SAUER Announces New M400 Series AR Pistol

    SIG SAUER has added a new model to their M400 AR series: the Switchblade.

    SIG SAUER has added a new model to their M400 AR series: the Switchblade.

    SIG SAUER is one of the biggest names in the world of gun brands. They’ve produced more than a few massively popular firearm models in their nearly half-century history. The recent transition from their German roots to a new US-based operational structure, with SIG Germany having shut down just over a year ago, appears to have done nothing to slow them down. Today the company offers an array of products to include pistols, rifles, optics, suppressors, ammo, and a cavalcade of other parts and accessories. Now their rifle-caliber pistol family has grown by one, with the announcement of the new Switchblade model.

    SIG SAUER’s M400 Series @ TFB:

    The Switchblade is an 11.5"-barrelled AR pistol, equipped with Magpul's new BSL brace and a Cerakote Titanium finish.

    The Switchblade is an 11.5″-barrelled AR pistol equipped with Magpul’s new BSL brace and with a Cerakote Titanium finish.

    The Switchblade belongs to SIG’s M400 series, which is their traditional 5.56-caliber AR lineup. Though there have been others previously that are now discontinued, the current M400 offerings other than the new Switchblade model feature SIG’s “Tread” branding, which the Switchblade does not. The series includes a standard 16″ base model, the Coil model that comes out of the box equipped with extras like a ROMEO5 red dot and flat-blade enhanced trigger, the Predator version with its hunting-purposed features, and an 11.5″ pistol variant with a Shockwave Blade pistol brace. While no official pricing info has been publicized as of the time of this writing, we do know that the new Switchblade addition is also an 11.5″-barrelled pistol, but features several key differences from the prior pistol model. These particulars are detailed in SIG’s press release copied below, as well as on their website.

    The Switchblade is differentiated from other M400 models by its controls, handguard, muzzle device, and more.

    The Switchblade is differentiated from other M400 models by its controls, handguard, muzzle device, and more.

    SIG SAUER Introduces M400 SWITCHBLADE Rifle Caliber Pistol

    NEWINGTON, N.H., (July 13, 2021) – SIG SAUER is pleased to announce the expansion of the M400 series with the introduction of the SIG SAUER M400 SWITCHBLADE, which brings the performance features of the popular M400 SDI platforms – that were purpose-built for competition shooters – to this rifle caliber pistol.
    “The M400 SWITCHBLADE brings an entirely new level of performance to the M400 product family with unmatched flexibility and capability,” said Tom Taylor, Chief Marketing Officer and Executive Vice President, Commercial Sales, SIG SAUER, Inc.  “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 SWITCHBALDE the ultimate performance pistol.”
    The SIG SAUER M400 SWITCHBLADE is an aluminum frame rifle caliber pistol featuring a Cerakote Titanium Elite finish, with a telescoping Magpul BSL Brace, an 11.5” cold hammer-forged carbon steel tapered barrel for easy suppressor installation with a three-prong flash hider, and a rigid free-floating handguard with M-LOK™ accessory rail that installs with a clamp system and designed to eliminate deflection from the added weight of accessory installation.  The pistol offers fully ambidextrous controls including the bolt catch, charging handle, and selector switch, has a 2-stage Matchlite Duo Trigger, and comes optics-ready.  The pistol is chambered in 5.56 NATO and ships with a thirty-round magazine.
    Overall length: 30 inches
    Overall height: 7.5 inches
    Overall width: 2.5 inches
    Barrel length: 11.5 inches
    Barrel Twist: 1:7

    The SIG SAUER M400 SWITCHBLADE pistol is now shipping and available at retailers. To learn more about the SIG SAUER M400 SWITCHBLADE, or watch the product video with Patrick Hanley, Rifle Product Manager, visit

    Images courtesy of SIG SAUER.
    Will P

    Lifelong hobby/sport shooter and hunter, former US Army infantryman, perpetual firearms student. Always seeking to become better and learn more. Interested in a wide variety of shooting disciplines, and passionate about all kinds of guns. Contact on Instagram: @WillTFB