AR-15 Magazine Features Ammunition Storage Components (ASC) builds some of the best magazines available on the market today. ASC magazines are built with the highest quality components to ensure reliable functioning and increased longevity. This is why they have become the approved supplier for many of the most well-known firearms manufacturers in the nation. AR-15 Magazine Specifications MFR:223-30RD-SS UPC:818805010069 Caliber:.223 Remington/5.56MM Capacity:30Rds Fits:AR-15 Finish:Black Chrome Silicon Spring Heat Treated for Strength and Durability Made in the USA