I have a Colt .38 super, full size government model. I have a Brown drop in 9mm barrel. I use a 13# recoil spring for the 9mm and a 15# for the .38 super. Both recoil springs are WC flatwire springs. My extractor is a Wilson Combat bullet proof, the ejector is stock Colt. Very reliable as a .38 super, I would carry this pistol. As a 9mm, once I found the right recoil spring weight, it has been reliable enough for match use. I use actual 9mm intended mags with the 9mm barrel, although some of my .38 mags do work. The 9mm designed mags are just better.