This 50-round drum magazine from ProMag is compatible with FN Scar 17 308 Winchester rifles.The drum housing is constructed of a proprietary DuPont Zytel-based polymer.The magazine's spring is formed from heat-treated stainless steel wire and has an injection-molded magazine follower so you can ensure reliable feeding and consistency.ProMag FN Scar 17 Drum Magazine308 Winchester Caliber50 RoundFDE FinishCompatible With FN Scar 17 RiflesOrder your ProMag FN Scar 17 magazine online today!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.