The HK 416 series rifle was designed for U.S. special forces as an alternative to the M-16 variant standard issue weapons. The 416 D145RS semi-automatic rifle features a quad rail forend, retractable buttstock with storage compartment, and a rail interface system which includes a fixed front sight with two different posts and a windage/elevation adjustable rear sight. This HK 416 D145RS semi-automatic rifle in .22 L.R. is manufactured exclusively by Walther under license from HK. It is the only genuine HK tactical rimfire replica available in the world.