Evolution Gun Works Recoil Spring ISMI Flatwire Officer's 16 lb.. Specifications for Evolution Gun Works Recoil Spring ISMI Flatwire Officer's: Manufacturer: Evolution Gun Works Color: Black Gun Make: Colt Gun Model: Colt Officer's ACP Condition: New Package Contents: Evolution Gun Works Recoil Spring ISMI Flatwire Officer's What firearm models does the manufacturer say Evolution Gun Works Recoil Spring ISMI Flatwire Officer's is compatible with? The manufacturer says that Evolution Gun Works Recoil Spring ISMI Flatwire Officer's is compatible with Colt Officer's ACPEvolution Gun Works 10659: Officer's Recoil Spring ISMI Flat Wire 16 lb.