Branded SOLGW 30 Round AR-15 MagazineFeatures :410 Stainless Steel AMS 5504/ASTM A240 MaterialT-360 Matte Black Isonite Nitriding FinishEverflex 17-7PH Condition C Gibbscote Stainless Steel SpringAdvanced Geometry Follower Nylon 6 and Glass Re-enforced