The HK 416 series rifle was designed for U.S. special forces as an alternative to the M-16 variant standard issue firearm. The 416 D Semi-Automatic Rifle features a quad rail forend, retractable buttstock with storage compartment, and Rail Interface System. The HK 416 D Semi-Automatic Rifle in .22 L.R. is manufactured exclusively by Umerex under license from HK. It is the only genuine HK tactical rimfire replica available in the world.