More economical addition to M&P rifle line. Chambered for 5.56 NATO, with black-anodized upper and lower receiver of 7075 T6 aluminum. Polymer hand guard, 16" 4140 steel barrel, 1:8 rate of twist. Adjustable sights, single-stage trigger, chrome-lined gas key and bolt carrier. Flash suppressor compensator. Introduced in 2011.