SIG SAUER M400 SDI X Pistol 5.56 NATO 11.5 Inch

Description

The SIG SAUER M400 SDI X Pistol is an AR pistol chambered in 5.56 NATO with an 11.5 inch cold hammer-forged steel barrel. Its semi-automatic action combines ambidextrous controls, a free-floating M-LOK handguard, and an optic-ready configuration without included sights. We see this as a practical range and training configuration for shooters who value adaptable controls and a compact format.

Key Specifications

• The pistol is chambered in 5.56 NATO for compatibility with the stated cartridge designation.
• The cold hammer-forged steel barrel measures 11.5 inches for the compact configuration specified by SIG SAUER.
• The semi-automatic action uses ambidextrous controls, including the bolt catch and release, safety selector, charging handle, and magazine catch.
• The barrel has a 1:7 twist rate as listed for this configuration.
• The free-floating handguard uses M-LOK accessory mounting on the stated handguard design.
• The trigger is a 2-stage flat-blade match trigger for the specified trigger configuration.
• The pistol has an anodized frame finish, with a black FNC barrel finish.
• The pistol accepts a 30-round magazine and includes one magazine.
• The package includes a Magpul BSL telescoping pistol brace.
• Listed weight with magazine is 5.8 pounds.

The controls and flat-blade trigger give this M400 SDI X configuration a clearly defined handling layout, while the free-floating handguard leaves the M-LOK interface available for compatible accessories. The low-profile gas block and carbine-length gas system are included in the stated design. Its black anodized finish, FNC-finished barrel, and polymer grip keep the configuration visually consistent. We stock it for shooters who want an AR pistol with a compact barrel, ambidextrous controls, and a supplied brace. The SIG SAUER M400 SDI X Pistol remains the focus.