SIG SAUER M400 SDI X Pistol 5.56 NATO 11.5″ 30rd

About this product

The M400 SDI X Pistol was developed with input from professional instructors at the SIG SAUER Academy to meet standards of performance and reliability. It features fully ambidextrous controls—including bolt catch/release, safety selector, charging handle and magazine catch—to support left- and right-handed operation and transitional shooting. The pistol ships with a free-floating M-LOK handguard, a match-style 2-stage flat blade trigger and a threaded muzzle with a hybrid compensator/flash hider. Built on an aluminum frame with a chrome moly steel barrel, the M400 SDI X is configured for optics and practical use in defensive and training roles.

Key Specifications

• Chambered in .223 Rem / 5.56 NATO.
• The barrel measures 11.5 inches.
• The action is Semi-Auto.
• The magazine capacity is 30 rounds.
• Includes 1 × 30-round magazine.
• The barrel material is chrome moly steel.
• The barrel finish is Black FNC.
• The rate of twist is 1:7.
• The trigger is a 2-stage flat blade match.
• Features a free-floating M-LOK handguard.

Purpose-built components and instructor-led development make the M400 SDI X Pistol a practical platform for disciplined shooters who value ambidextrous ergonomics, match-grade trigger feel and an accessor-ready chassis. Its combination of a chrome moly barrel, M-LOK handguard and telescoping brace creates a compact, configurable package suited to training and defensive applications.

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