Sig Sauer M400 SDI X 5.56 NATO 11.5in 30rd Brace – Black

The Sig Sauer M400 SDI X is an AR-style pistol chambered for 5.56 NATO with an 11.5-inch barrel. It includes fully ambidextrous controls, a free-floating M-LOK handguard, and a Magpul BSL telescoping stabilizing brace. The design pairs a 2-stage flat blade match trigger with a 30-round removable magazine for sustained range use and training.

Key Specifications

• The caliber is 5.56 NATO / .223 Rem.
• The barrel measures 11.5 inches.
• The barrel is made from chrome moly steel.
• The barrel finish is Black FNC.
• The barrel has a 1:7 inch rate of twist.
• The pistol ships with a 30-round removable magazine.
• The action is semi-automatic.
• The trigger is a 2-stage flat blade match.
• The handguard is a free-floating M-LOK design.
• The pistol includes a Magpul BSL telescoping brace.

Engineered for instruction, range work, and practical shooting, the M400 SDI X balances control and modularity without unnecessary complexity. Its ambidextrous controls, rigid handguard and match-style trigger support consistent performance and easy accessory integration, making it a straightforward choice for experienced shooters seeking a capable AR-style pistol platform.