Sig Sauer M400 Sentry Rifle

The Sig Sauer M400 Sentry is a premium-grade 5.56 NATO AR-platform rifle engineered for precision, reliability, and adaptability in both tactical and sporting environments. Combining a rugged build with refined ergonomics, the M400 Sentry delivers the dependable performance Sig Sauer rifles are known for.

Built around a free-floating M-LOK handguard, the Sentry offers superior barrel harmonics and mounting flexibility for optics or accessories. Its 16-inch carbon steel barrel ensures consistent accuracy, while the flat blade, single-stage trigger provides a crisp and predictable pull.

The rifle’s Magpul SL-K stock enhances control and maneuverability without sacrificing comfort. Paired with a mid-length gas system, the M400 Sentry delivers smoother recoil impulse and superior balance for extended shooting sessions.

Specifications & Features

• Caliber: 5.56 NATO

• Action: Semi-automatic, direct impingement

• Barrel Length: 16″ carbon steel

• Trigger: Flat blade, single-stage

• Handguard: Free-floating M-LOK

• Stock: Magpul SL-K adjustable stock

• Gas System: Mid-length

• Capacity: 30 rounds

• Finish: Matte black

• Purpose: Tactical, competition, or range use

Designed for shooters who demand accuracy, durability, and modularity, the Sig Sauer M400 Sentry is a proven platform that excels from range to field.