Sig Sauer M400 5.56 NATO

The Sig Sauer M400 is a cartridge-specific modern sporting rifle engineered for range work, training, and competition-style shooting. Its configuration emphasizes modularity and accessory compatibility while providing a familiar AR-style ergonomics for a wide variety of shooting applications.

Built on the M400-SDI X platform, this model features a free-floating M-LOK handguard, a 16-inch chrome-moly steel barrel with a 1:7 twist rate, and a 6-position Magpul MOE-SL stock for adjustable length of pull. The rifle is furnished with ambidextrous controls, a SIG 2-stage Matchlite Duo trigger, a ROMEO5 Gen II red dot optic, and a FOXTROT-MSR full-size weapon light for an out-of-the-box accessory package.

Key Specifications

• The caliber is .223 Rem/5.56 NATO.
• The barrel length is 16 inches.
• The action type is Semi-Auto.
• The magazine capacity is 30 rounds.
• The unloaded weight is 8 lb.
• The overall length is 36.5 inches.
• The twist rate is 1:7.
• The stock is a 6-position Magpul MOE-SL.
• The forend is a free-floating M-LOK alloy handguard.
• The package includes a ROMEO5 Gen II red dot and FOXTROT-MSR full size light.

The Sig Sauer M400 5.56 NATO offers a well-appointed AR-platform option with factory-installed optics and illumination for those seeking a ready-to-use configuration. Consider the Sig Sauer M400 5.56 NATO for customers who prioritize accessory compatibility, ergonomics, and established 5.56 performance.