SIG SAUER M400 SDI XSeries 5.56 AR-15 Rifle - 16" - Moss Green

Developed in collaboration with the elite instructors of SIG SAUER Academy, the M400 SDI XSeries is purpose-built to deliver unmatched performance, reliability, and adaptability in any shooting environment. Drawing from decades of real-world training experience, this rifle incorporates premium features and professional-grade engineering to meet the highest standards of both defensive and competitive shooters. With a durable Moss Green Cerakote finish, fully ambidextrous controls, and precision components, the M400 SDI XSeries is ready to perform right out of the box.

Features:

• Chambered in 5.56 NATO
• 16" Barrel
• Moss Green Cerakote finish
• Fully ambidextrous controls, including unique bolt catch/release
• Free-floating handguard with steel lockup for maximum rigidity and reduced deflection
• Accessory-ready rail system on all four sides without affecting accuracy
• Low-profile gas block with mid-length gas system for smooth recoil impulse
• 2-Stage SIG Matchlite Duo Trigger with flat blade and crisp 4.5–6.5 lb pull
• Magpul SL Stock for ergonomic, adjustable shoulder fit
• Equipped with compensator/flash hider for improved muzzle control

The M400 SDI X’s fully ambidextrous design ensures effortless handling for both left- and right-handed shooters, while making transitions between shoulders faster and more natural. Its innovative free-floating handguard features a dual clamp steel locking system, drastically reducing deflection to preserve accuracy under load and allowing for secure accessory attachment from all angles.

The precision-engineered 2-Stage Matchlite Duo Trigger offers a clean, consistent break for enhanced accuracy and control, paired with a flat blade design that promotes a consistent finger position. Combined with a low-profile gas block, mid-length gas system, and premium performance coatings, the M400 SDI X delivers smooth recoil, exceptional durability, and absolute reliability in any condition.