There's a guyin Texas who apparently has a dozen or more Combat Masters, and some or all are up for auction. In my experience, the most common CM is the Mk V (matte stainless), followed by the Mk. I (matte blue). Mk. VI would be next (polished flats/matte rounds, adjustable rear sight. This guy has Mk. II's, IV's, etc. Go to auctionarms.com, and search "Detonics".