Heckler & Koch Pistol Magazine Mark 23 .45 ACP 12 Round Black 12. Specifications for Heckler & Koch Mark 23 .45 ACP 12 Round Pistol Magazine: Manufacturer: Heckler & Koch Gun Make: Heckler & Koch Gun Model: Heckler & Koch Mark 23 Caliber: .45 ACP Magazine Capacity: 12 Round Color: Black Quantity: 1 Fabric/Material: Steel Package Contents: Heckler & Koch Mark 23 .45 ACP 12 Round Pistol Magazine What firearm models does the manufacturer say Heckler & Koch Mark 23 .45 ACP 12 Round Pistol Magazine is compatible with? The manufacturer says that Heckler & Koch Mark 23 .45 ACP 12 Round Pistol Magazine is compatible with Heckler & Koch Mark 23Heckler & Koch 50248615: Pistol Magazine Mark 23 .45 ACP 12 Round Black 12