Generally, when you think SIG Sauer rifles, you're thinking of high-dollar rifles that run in elite circles. The SIG Sauer M400 Tread makes it possible to have all the premium features found on a high-quality SIG Sauer rifle at a price you can afford, and the Tread system this rifle is built on makes it easy to upgrade and change out components, so you can make your rifle truly your own. Each SIG Sauer M400 Tread is built with a mid-length gas system that ensures reliability while preventing excess wear on internal components from overgassing. An added benefit of this system is that it softens recoil, so you'll have a sweet-shooting rig. The direct-impingement action is built Mfg: Sig Sauer, Inc.