The Sig Sauer M400 SDI X is a compact AR-style pistol chambered for 5.56 NATO with an 11.5 inch cold hammer-forged chrome moly steel barrel. Intended for informed shooters who value modularity and ambidextrous controls, the SDI X features a free-floating M-LOK handguard and a Matchlite 2-stage trigger for consistent pull characteristics. Controls are fully ambidextrous to support left- and right-handed operation.
Key Specifications
- The barrel measures 11.5 inches and is cold hammer-forged from chrome moly steel.
- The cartridge is 5.56 NATO (.223 Rem).
- The barrel material is chrome moly steel with a Black FNC finish.
- The handguard is a free-floating M-LOK design for accessory mounting.
- The trigger is a 2-stage flat blade match style for a crisp, predictable break.
- The magazine capacity is 30 rounds.
- Included with the pistol is 1 x 30-round magazine.
- The pistol uses a Magpul BSL telescoping brace.
- The listed weight with magazine is 5.8 lb.
- The barrel twist rate is 1:7 in.
The M400 SDI X is built for shooters who require a reliable, configurable platform in a compact package. Its ambidextrous controls, rigid free-floating handguard, and match-style trigger make it well suited to range use and modular builds where ergonomics and repeatable performance matter. The design balances controllability and compactness while supporting common AR-style accessories and optics.
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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