The SIG Sauer M400 SDI X chambered in 5.56 NATO is a lightweight, modern sporting rifle built for reliability and performance. Featuring an M-LOK rail system for easy customization, and a "MVG" short fore grip. this rifle is ready for optics, lights, grips, and other accessories right out of the box. Includes 1 magazine only. Whether you're hitting the range or adding a dependable AR to your collection, this M400 SDI X delivers the quality and versatility SIG is known for. #1604559-OMM-RB