Sig Sauer M400 SDI 5.56 NATO 11.5-Inch Pistol

The Sig Sauer M400 SDI is a semi-automatic pistol chambered in 5.56 NATO and configured with an 11.5-inch barrel. Its ambidextrous controls, free-floating M-LOK handguard, flat-blade match trigger, and Magpul BSL telescoping brace support practical range and training use.

The platform features a low-profile gas block with a carbine-length gas system, a hybrid compensator/flash hider, and a black anodized finish. It includes one 30-round detachable magazine.

Key Specifications

• The chambering is 5.56 NATO for compatibility with the listed cartridge.
• The action is semi-automatic for practical range operation.
• The barrel measures 11.5 inches and uses a 1:7-inch twist rate.
• The barrel is made from hammer-forged chrome moly steel with an FNC finish.
• The free-floating handguard provides M-LOK accessory mounting.
• The trigger is a 2-stage flat-blade match trigger with a listed pull weight of 4.5 to 6.5 pounds.
• The controls include ambidextrous bolt catch, release, safety selector, charging handle, and magazine catch.
• The included detachable magazine has a capacity of 30 rounds.
• The pistol includes a Magpul BSL telescoping stabilizing brace.
• The listed weight with magazine is 5.8 pounds, and the finish is black anodized.

With a rigid free-floating handguard, match-style trigger, adaptable mounting surface, and controls designed for use from either side, the M400 SDI offers a well-equipped configuration for shooters seeking a capable 5.56 NATO platform.

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