SIG Sauer's M400 line is the company's AR-pattern rifle family, and this SDI XSeries model is chambered in 5.56 NATO with a 16-inch barrel, wearing a distinctive Moss Green finish. Sixteen inches remains the most useful general-purpose carbine length, keeping the rifle maneuverable while giving 5.56 enough barrel to reach the velocity its bullets are designed around.

The XSeries configuration is aimed at competition and hard use, with a free-floating M-LOK handguard that lets you position lights, hand stops, and bipods exactly where you want them without touching the barrel. SIG's manufacturing and finish work are the reason the M400 has held its place in a very crowded market.

This firearm ships to your chosen FFL dealer for transfer. Order online from Dawson Defense, an Arizona-owned licensed dealer and importer.