6.8 SPC

6.8mm SPC is an intermediate rifle cartridge developed by Remington in collaboration with members of the U.S. Army Marksmanship unit and USSOC. The idea was to replace the 5.56 NATO cartridge in short barreled rifles and carbines, 6.8 SPC is based on .30 Remington and is midway between 5.56 and 7.62 NATO. In 2007 the 6.8 SPC had fallen out of favor with the Military due to longer engagement distance in Afghanistan. However, around the same time most major manufacturers of AR-15s offered rifles to the civilian market.