There probably isn't a pistol that benefits more from a Full Length Guide Rod conversion than the Officers Model. First of all, you receive the typical reliability and accuracy improvements which are inherent with a two piece full length guide rod. Then replace the failure prone stock plug with a highly reliable reverse plug and a single 24# spring. The result is a drastic improvement in performance that will surely be noticed the first time you fire your pistol. This kit will work with the Colt Officer's Model or Para-Ordnance P12, however both require a slight modification to the slide for installation (instructions included). The limited space in an Officer's Model and P12 pistol causes extreme stress to be exerted on the recoil spring.