Nighthawk Custom Spring Kit - Commander .45 ACP. The springs of a 1911 pistol relax over time especially with hard use. Having the best quality springs for your 1911 is critical for reliable function whether on the range or in self-defense applications. The Nighthawk Custom spring kit includes the springs you will need to build or re-build your pistol. This spring kit is designed for a .45 ACP 1911 and includes two standard recoil springs an extra power recoil spring for +P loads a reduced power mainspring and an extra power firing pin spring. Specifications for Nighthawk Custom 1911 .45 ACP Spring Kit: Manufacturer: Nighthawk Custom Fabric/Material: Steel Gun Make: Colt Length: 8.5 in Caliber: .45 ACP Package Contents: Nighthawk Custom 1911 .45 ACP Spring Kit The Nighthawk Custom Nighthawk Spring Kit Commander .45 Acp is a quality addition to the Nighthawk Custom lineup. For more great deals on Pistol Slides & Slide Parts by Nighthawk Custom please browse our Nighthawk Custom Gun Parts page. What firearm models does the manufacturer say Nighthawk Custom 1911 .45 ACP Spring Kit is compatible with? The manufacturer suggests that Nighthawk Custom 1911 .45 ACP Spring Kit is compatible with Colt Commander 1911 Commander 4.25in Colt 1911 Government 1911 Government 5inNighthawk Custom Nighthawk Spring Kit Commander .45 Acp