ASC AR-15 Magazine Features Ammunition Storage Components LLC or ASC is the premier manufacturer and supplier of AR magazines to the rifle industry. They provide the different capacities of aluminum and stainless steel in .223/5.56 6.8 SPC 6.5 Grendel .308 7.62 x 39 5.45 x 39 and 9mm for the AR15 M-16 and M-4 family of rifle. ASC goes above and beyond current industry standards to ensure the quality of our magazines are second to none. ASC AR-15 Magazine Specifications Manufacturer: Ammunition Storage Components Manufacturer Part #: 223-20RD-SS Type: Magazine Caliber: .223 Remington / 5.56 NATO Capacity: 20 Rounds Color: Black Fit: AR-15