Pro Mag 1911 Officers .45 ACP Pistol Magazine Steel Blue 6 Round COL 01-6RD. s Model pistol in .45 ACP. Constructed from heat-treated blued-steel with a follower lock-plate and base-plate molded from a proprietary DuPont Zytel based black polymer; and using a spring wound from Chrome-silicon wire and heat-treated for strength and reliability. Specifications for Pro Mag 1911 Officers .45 ACP Pistol Magazine: Manufacturer: ProMag Gun Make: 1911 Platform Gun Model: Colt 1911 Officer .45 ACP Caliber: .45 ACP Magazine Capacity: 6 Round Color: Blue Fabric/Material: Steel Package Contents: Pro Mag 1911 Officers .45 ACP Pistol Magazine What firearm models does the manufacturer say Pro Mag 1911 Officers .45 ACP Pistol Magazine is compatible with? The manufacturer suggests that Pro Mag 1911 Officers .45 ACP Pistol Magazine is compatible with Colt 1911 Officer .45 ACPPro Mag COL 01-6RD: 1911 Officers .45 ACP Pistol Magazine Steel Blue 6 Round