Give your 9mm AR-15 a capacity upgrade with this ProMagA(R) Glock-style Drum Magazine. It's quality-made right here in the USA. Fits AR-15 pattern carbines that use Glock-style double-stack 9mm magazines Rugged ZytelA(R) polymer body Injection-molded follower Full-length steel insert Heat-treated stainless steel spring Order today!