IMG Glock 40 S&W 31 Round Pistol Magazine Black. 40 S&W Magazine for Glock models 2223273132 and 33. 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 40 S&W 31 Round Pistol Magazine: Manufacturer: IMG Gun Make: Glock Gun Model: Glock 22 Caliber: .40 S&W Magazine Capacity: 31 Round Color: Black Quantity: 1 Fabric/Material: Polymer Package Contents: IMG Glock 40 S&W 31 Round Pistol Magazine What firearm models does the manufacturer say IMG Glock 40 S&W 31 Round Pistol Magazine is compatible with? The manufacturer suggests that IMG Glock 40 S&W 31 Round Pistol Magazine is compatible with Glock 22IMG GL-0001-31RD: Glock 40 S&W 31 Round Pistol Magazine Black