This two piece guide rod is designed to be used with heavy taper cone barrels when the barrel bushing has been eliminated. For quick field striping, the guide rod has been drilled and a staking pin is provided for pinning back the plug. Minor slide modification required for installation. The Colt Officers Model and Para Ordnance P12 require a slight modification to the slide for installation. Package includes: guide rod, plug, 24# recoil spring & Allen wrench with instructions. WS25 For the Colt Officers Model, Lightweight Officers Model, 1991 A1 Compact, Officers Model Enhanced and Para-Ordnance P-12.