IMG Glock 9mm 33 Round Pistol Magazine Red. Mag body is made of virtually indestructible black nylon molded around steel inserts. Magazine spring is made from heat-treated chrome silicon wire for stiffness and durability. Witness holes are clearly visible to let the shooter know how much ammo is available at a glance. Designed for Glock Gen 3 and subsequent models. Manufacturers Lifetime Warranty. Specifications for IMG Glock 9mm 33 Round Pistol Magazine: Manufacturer: IMG Gun Make: Glock Caliber: 9mm Luger Magazine Capacity: 33 Round Quantity: 1 Condition: New Fabric/Material: Polymer Package Contents: IMG Glock 9mm 33 Round Pistol Magazine IMG GL-0004R-33RD: Glock 9mm 33 Round Pistol Magazine Red