SIG Sauer M400 SDI X 5.56 NATO 16in Moss Green 30rd

About this product

The Sig Sauer M400 SDI X is a modern sporting rifle chambered .223 REM/5.56 NATO with a 16 in threaded, cold hammer-forged barrel and a Moss Green Cerakote finish. Designed with input from instructors at the SIG SAUER Academy, the M400 SDI X emphasizes reliable function and ambidextrous operation for both left- and right-handed shooters. It features a free-floating M-LOK handguard with a steel lockup, a mid-length direct impingement gas system, and ships with a 6-position Magpul MOE-SL stock and one 30-round polymer magazine.

Key Specifications

• The caliber is .223 REM/5.56 NATO.
• The barrel measures 16 in and is threaded.
• The barrel twist rate is 1:7 in.
• The magazine capacity is 30 rounds (one magazine included).
• The operating system is Mid-Length Direct Impingement.
• The muzzle device is a SIG Flash Hider-Compensator.
• The trigger is a SIG 2-Stage Matchlite Duo with a flat blade profile.
• The stock is a 6-Position Magpul MOE-SL (Black).
• The finish is Moss Green Cerakote.
• The overall length is 36.5 in and the unloaded weight is approximately 7 lbs.

The M400 SDI X packages instructor-led design features into a practical platform suited for range training, duty use, and precision-oriented recreational shooting. With fully ambidextrous controls, a rigid free-floating handguard, and a two-stage Matchlite trigger, it offers a balanced blend of ergonomics and repeatable performance in a rugged, finished package.

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