Barrett M82
The Barrett M82 (standardized by the U.S. military as the M107) is a recoil-operated, semi-automatic anti-materiel rifle developed by Barrett Firearms Manufacturing and produced in the United States. Also called the Light Fifty (due to its chambering of the .50 BMG 12.7×99mm NATO cartridge), the weapon is classified in three variants: the original M82A1 (and M82A3) models, the bullpup M82A2 model, and the Barrett M107A1, with an attached QDL adapter muzzle brake (designed to accept a suppressor, and made lighter with the use of aluminum and titanium).