SIG M400 PRO 5.56mm Semi-Auto Rifle | 16" Barrel

Accurate, lightweight and crafted from the finest components, the SIG M400 PRO sets the new standard for direct-impingement AR-15s. Designed for elite forces and refined by the world’s best professional shooters to be the ultimate AR performance rifle.

Many of today’s rifles ship with plastic handguards and throwaway furniture, two things not found on the SIGM400 PRO, SIG SAUER’s take on what an AR-15 should be. This carbine comes with the good stuff—all of it—pre-installed. Like a free-floating M-LOK handguard, which promotes accuracy and handling. Or a quality grip and premium, 6-position buttstock with integral QD points. The M400 PRO comes standard with AMBI controls. The Enhanced SIG Trigger on the M400 PRO enables the shooter to extract excellent accuracy from the rifle’s lightweight, 16” nitride barrel that is equipped with a SIG Micro-light Gas Block.