20 round AR patterned magazine. Designed to be used with .350 Legend ammunition in a standard AR15 magazine well. Stainless Steel body with a black finish.20 Round CapacityStainless Steel Body, Black Finish**Due to design variations between manufacturers on the barrel extension/feed ramp of the 350 Legend barrel, our magazine may not function with any other manufacturers' barrel without the necessity of modification to the magazine, depending on the manufacturer specs on the barrel**