Made from special injection-molded, glass-filled polymer for maximum durability and reliability, the ProMagA(R) FNA(R) Five-SeveNA(R) USG 5.7x28mm 10-Round Polymer Magazine is a performance-enhanced aftermarket pistol magazine, engineered to deliver smooth, jam-free operation in any tactical or personal defense application. The heat-treated chrome silicon wire spring and injection-molded polymer follower deliver smooth, reliable feeding and jam-free operation, while the precision-engineered feed lips deliver a snug fit for added reliability. Better yet, this magazine is backed by ProMag's legendary lifetime warranty, promising years of consistent field service and unwavering reliability when it matters most. Made in USA. *10-round Block is not permanent, so it is NOT Ban State Compliant.*