Browse the selection of options & features with SIG SAUER's collection of M400 and SIG M400 TREAD variants; direct impingement operating system, AR 15 platform.

The M400 is an air-cooled, direct impingement gas-operated, magazine-fed carbine based on the earlier AR-15 rifle. [2] It is chambered for either 5.56×45mm NATO or .300 AAC Blackout cartridges, and …

Building upon their decades of experience and countless hours of instruction, we have developed the M400-SDI X to meet the highest standards of performance and reliability.

The SIG Sauer M400 is a family of AR-15-style rifles and pistols that cater to a variety of shooting applications, including self-defense, recreational shooting, and professional use. The M400 is built on …

Dec 28, 2025 · The SIG M400 is a popular AR-15 rifle (and one of our favorites) that is known for its accuracy, reliability, and value. It is a great choice for both beginners and experienced shooters.

Feb 24, 2025 · With hand-selected features by World Champion competitive shooter Lena Miculek, SIG Sauer has a new addition to the Rose community in the form of a special edition M400 rifle.

This combination of standardized features makes the M400-SENTRY an out-of-the-box solution for home/personal defense, advanced training or recreational shooting. Like other rifles in the series, the …

With its combat-proven lineage, user-driven enhancements, and future-ready architecture, the SIG SAUER M400 is the ultimate AR platform for those who refuse to compromise on performance, …

Chambered in 5.56 NATO, the M400 TREAD has a 16in stainless steel barrel offering extreme durability and corrosion resistance while improving accuracy. The barrel is also fitted with a 3-prong flash hider …

Online shopping from a great selection of discounted M400 at Sportsman's Outdoor Superstore.