Sig Sauer M400 SDI X 5.56 NATO 16″ 30rd

The Sig Sauer M400 SDI X is a modern sporting rifle built for reliable performance in training, range work, and general-purpose use. It features fully ambidextrous controls, a mid-length direct impingement gas system, and a free-floating M-LOK handguard for modular accessory mounting. The platform ships with a Magpul MOE-SL style adjustable stock and a 30-round polymer magazine to support extended range sessions.

Key Specifications

• The caliber is .223 REM/5.56 NATO.
• The barrel measures 16 inches.
• The twist rate is 1:7.
• The muzzle threads use 1/2×28 pitch.
• The muzzle device is a SIG Flash Hider-Compensator.
• The action type is Semi-Auto.
• The operating system is Mid-Length Direct Impingement.
• The stock is a 6-position Magpul MOE-SL.
• The rifle ships with (1) 30rd polymer magazine.
• The weight with magazine installed is 7 lbs.

Engineered for shooters who value dependable, well-equipped rifles, the M400 SDI X combines ambidextrous ergonomics, a match-style two-stage trigger, and a rigid free-floating handguard to deliver a capable and adaptable platform for range use, training, and general-purpose shooting. Its accessory-ready layout and familiar controls make it straightforward to configure for a wide range of practical setups.

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