The SIG Sauer M400 Forge is the workhorse of SIG's AR line: a 5.56 NATO carbine with a 16-inch barrel, a free-floating M-LOK handguard, and a mil-spec-compatible parts interface that accepts the enormous aftermarket the platform enjoys. This one wears a Flat Dark Earth finish.

Sixteen inches is the length that made the modern carbine what it is, short enough to work in vehicles and doorways and long enough for 5.56 to perform as designed out to a few hundred yards. The free-float handguard is the meaningful upgrade over older designs, keeping accessories and sling tension off the barrel so your zero holds.

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