The SIG Sauer M400 SDI is a semi-automatic modern sporting rifle built around a mid-length direct impingement gas system and a 16-inch barrel. It features fully ambidextrous controls, a free-floating M-LOK handguard and a 6-position Magpul MOE-SL stock for adaptable ergonomics. The rifle ships with a single 30-round polymer magazine and is finished in Moss Green Cerakote for subdued appearance and corrosion resistance.
Key Specifications
- Chambered for .223 Rem / 5.56 NATO.
- The barrel measures 16 inches for balanced handling and compatibility with standard-length ammunition.
- Powered by a semi-automatic action.
- Features a mid-length direct impingement gas operating system.
- Equipped with a 6-position Magpul MOE-SL stock in black for adjustable length of pull.
- Includes 1 x 30-round polymer magazine with the rifle.
- Uses a SIG 2-stage Matchlite Duo trigger with a flat profile.
- Forend is a M-LOK, Moss Green Cerakote handguard with accessory rail options.
- Overall length is 36.5 inches with the stock extended.
- Weight with magazine is approximately 7.0 lb.
The M400 SDI blends ambidextrous controls, modular M-LOK accessory options and a match-style trigger into a versatile AR-platform rifle suitable for range work, training and general-purpose field use. Its Moss Green Cerakote finish and Magpul furniture provide a durable, low-profile package for shooters who prioritize reliable, serviceable equipment.
Product information is supplied by the manufacturer and/or distributor and may be automatically formatted or enhanced using AI for clarity and consistency. While we strive for accuracy, specifications, features, and included items may change without notice. Always verify details using the manufacturer’s official documentation and the information shown on this product page before purchase or use.
Related Videos:
