Glock Factory Original Glock 20 10mm 10 Round Pistol Magazine Black 10 GL2239. Factory Glock magazines have a hardened steel insert encased in high tech polymer. This polymer coating protects the magazine and prevents deformation even when dropped from a great height Specifications for Glock Factory Original Glock 20 10mm 10 Round Pistol Magazine: Manufacturer: Glock Gun Make: Glock Gun Model: Glock 20 Caliber: 10mm Auto Magazine Capacity: 10 Round Color: Black Condition: New Fabric/Material: Polymer Package Contents: Glock Factory Original Glock 20 10mm 10 Round Pistol Magazine What firearm models does the manufacturer say Glock Factory Original Glock 20 10mm 10 Round Pistol Magazine is compatible with? The manufacturer suggests that Glock Factory Original Glock 20 10mm 10 Round Pistol Magazine is compatible with Glock 20Glock GL2239: Factory Original Glock 20 10mm 10 Round Pistol Magazine Black 10