Previously made exclusively for the United States military, the Okay® Surefeed® AR-15 .223 Rem/5.56 20-Round Magazine boasts a lightweight, heat-treated aluminum body with a hard-coat anodized finish for superior corrosion resistance and lasting durability. The Mil-Spec stainless steel spring and 4-way, anti-tilt follower ensure smooth, snag-free feeding, while a Mil-Spec dry film lubricant delivers smooth insertion and added corrosion resistance for long-lasting, reliable service. Made in USA.