Introduced into U.S. market after the federal government prohibited importation of H&K's other semi-automatic rifles. SR9 similar to HK91, but certified by BATF as a sporting rifle. Features special thumbhole stock made of Kevlar reinforced fiberglass. Action is a delayed-roller locked bolt semi-automatic design chambered for .308 Winchester cartridge. Barrel 19.7" in length and features adjustable rear sight, with hooded front sight. Weight 10.9 lbs.