This 50-round drum magazine from ProMag fits most AR-308/.308 Cal AR-type rifles using LR-308 (DPMS) or SR-25 pattern magazines.The magazine body is constructed of a proprietary DuPont Zytel-based polymer featuring over-molded stamped steel feed lips as well as a steel magazine catch.The stainless steel magazine spring is heat treated for improved durability and longevity.ProMag AR-308 308 Winchester Drum Magazine50 Round CapacityFDE FinishIncludes LoaderPolymer Body w/Steel Lips and Steel Magazine CatchOrder your ProMag 50-round drum magazine online today!*Does not fit rifles using Armalite pattern magazines Save time and money when you purchase .308 or 7.62x51 ammo at Ammunition Depot! Our online inventory of cheap ammo for sale is available from the top brands you know and trust.