The Sig Sauer M400 SDI X-Series is a factory-equipped AR-platform rifle chambered for 5.56 NATO. It pairs a 16″ chrome-moly barrel with a 15″ free-float M-LOK handguard, a Magpul SL-K telescoping stock and a SIG Flatblade Match trigger. The rifle ships with one 30-round polymer magazine and includes ambidextrous controls for improved handling.
Key Specifications
- The caliber is 5.56 NATO (.223 Rem).
- The barrel measures 16 inches.
- The barrel material and finish are chrome moly steel with Black FNC finish.
- The handguard is a 15-inch free-float M-LOK configuration.
- The stock is a Magpul SL-K six-position telescoping unit.
- The trigger is a SIG Flatblade Match trigger.
- The action type is Semi-Auto.
- The package includes one 30-round polymer magazine.
- The listed weight is approximately 7.0 lb.
- The muzzle device is a hybrid compensator/flash hider with 1/2-28 tpi.
Built to deliver out-of-the-box performance, the M400 SDI X-Series is well suited for range work, competitive stages, and defensive readiness. Its blend of a precision-minded trigger, rigid free-floating handguard and proven barrel materials make it a capable, reliable platform for informed shooters seeking a no-nonsense modern sporting rifle.
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.
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