What is 6.8 barrett?

The 6.8 Barrett is a cartridge developed in 2002 by Barrett Firearms Manufacturing as an intermediate cartridge for the AR-15 platform. It has a bullet diameter of .277 inches (7mm) and a case length of 1.68 inches. The 6.8 Barrett was designed to offer increased lethality and accuracy compared to the standard 5.56 NATO cartridge, while maintaining compatibility with the AR-15 platform. The cartridge has been used in military and law enforcement applications, as well as in hunting and sport shooting. It has a maximum effective range of approximately 800 meters and is capable of delivering significantly more energy at extended ranges than the 5.56 NATO. While the 6.8 Barrett has gained some popularity, it has not been widely adopted by the military and is not as common as other intermediate cartridges.