The Windham Weaponry 10 Rd. Magazine is manufactured to the highest possible standards to offer you the utmost in reliability, performance and durability. They incorporate the best Magpul® Gen III self leveling follower featuring a four way anti-tilt design with spring stabilizers on top of a 17-7 PH stainless steel spring. The 6061-T6 aluminum magazine box is black Teflon® coated inside and outside. Made in USA.