Sig Sauer M400 SDI XSeries, 5.56mm, 16" Barrel, 1- 30 Round Magazine, Black, Rifle

The Sig Sauer M400-SDI X stands as the ultimate evolution of the direct-impingement AR-15, engineered in direct collaboration with the elite instructors at SIG SAUER Academy to deliver competition-level performance in a duty-ready package. Fully ambidextrous controls—including a proprietary ambidextrous bolt catch/release integrated into the forged lower—make transitions, reloads, and manipulations seamless for both right- and left-handed shooters. The free-float M-LOK handguard features an innovative dual-clamp steel locking system that virtually eliminates deflection, ensuring accessories mounted anywhere on the rail have zero impact on point-of-impact consistency.

At the heart of the SDI X beats a crisp SIG 2-Stage Matchlite Duo flat-blade trigger with a clean 4.5–6.5 lb pull, providing match-grade precision straight from the factory. A mid-length gas system paired with a low-profile gas block and SIG’s hybrid compensator/flash hider delivers soft recoil impulse and flat shooting characteristics, while the 16-inch chrome-moly barrel with 1:7 twist stabilizes heavy 5.56mm and .223 loads with ease. Finished in durable hard-coat anodizing and equipped with a collapsible Magpul SL stock and reduced-angle grip, this 7-pound carbine is optics-ready and built to excel in dynamic training, 3-gun competition, or home defense roles.

Backed by SIG’s relentless quality standards and Academy-proven enhancements, the M400-SDI X raises the bar for what an out-of-the-box AR-15 can achieve. Elevate your shooting performance with the rifle designed by the pros, for the pros—order your Sig Sauer M400-SDI X 5.56 NATO today at Battlehawk Armory.

Specifications:

• Caliber: 5.56mm NATO
• Sights: Optics Ready
• Barrel Length: 16"
• Barrel Material: Chrome/Moly Steel
• Twist Rate: 1:7"
• Threads: 1/2"x28 TPI Tapered Shoulder
• Muzzle Device: Sig Flash Hider-Compensator
• Action Type: Semi-Auto
• Operating System: Mid-Length Direct Impingement
• Stock Type: 6-Position Black Magpul SL
• Grip Type: Reduced Angle
• Trigger Type: Sig 2-Stage Matchlite Duo
• Trigger Shape: Flat
• Manual Safety: Ambidextrous
• Forend Type: M-Lok Black Anodized Alloy
• Accessory Rail: M-Lok/Picatinny
• Mag Type: AR-15
• Mags Included: 1- 30rd Polymer
• Color: Black
• Receiver Finish: Hard-Coat Anodized
• Overall Length: 36.5"
• Collapsed Length: 33.3"
• Overall Width: 2.8"
• Height: 7.1"
• Weight: 7.0 lbs
• Forward Assist: Yes