The Ruger/ASC 6.8 magazine is designed to be compatible with any AR-15 chambered in the popular 6.8 SPC cartridge and will hold 25 rounds of ammunition. The magazine is made from high quality Stainless Steel and features a Blackened finish. You can be all but certain that this magazine will fit perfectly and function flawlessly the same as with the magazine(s) that shipped with your firearm.