CM Products Railed Power Mag .45 ACP. The RPM design is the result of a relentless pursuit of excellence maximizing reliability and durability under all conditions. The dual wall feed rails have revolutionized 1911 magazines. The feed rails built into the RPM are at lest twice as strong as any traditional 1911 magazine feed lips and provide the smoothest feeding surface. Specifications for Chip McCormick Power Mag Railed 1911 Government .45 ACP 8 Round Pistol Magazine: Manufacturer: Chip McCormick Gun Make: Colt Gun Model: 1911 Caliber: .45 ACP Magazine Capacity: 8 Round Fabric/Material: Stainless Steel Package Contents: Chip McCormick Power Mag Railed 1911 Government .45 ACP 8 Round Pistol Magazine What firearm models does the manufacturer say Chip McCormick Power Mag Railed 1911 Government .45 ACP 8 Round Pistol Magazine is compatible with? The manufacturer says that Chip McCormick Power Mag Railed 1911 Government .45 ACP 8 Round Pistol Magazine is compatible with 1911Chip McCormick Custom 17130 1911 45 ACP 8 Rd Stainless Finish