I am bummed that I did not see this thread sooner and that I am not currently residing in my Washington state home. Family matters. I have so much I could share. If I were, I could have taken photos of the nine Combat Masters that I currently own. In 2011 I got into shooting and collecting with my main focus at the time being in 45 ACP handguns. I became fascinated with the Combat Masters, at first because of the history of their production in the Seattle area. But even more so after I purchased my first one. It was one of the good ones. Explanation upcoming. It is blued, all carbon steel in the "C" serial number range. The frame to slide fit was good with no overhang in the back. This one came with a set of grips that I have never seen on any other Combat Master. The left grip panel looked like factory checkered wood, but the right grip panel is checkered but has a palm swell incorporated. It fit my hand so well and shot so well the obsession was off and running. Having a good magazine seems to be key with reliability. The factory ones as mentioned above marked Detonics .45 A.P.C worked the best for me. The magazines from Metalform are ok but the magazines from Triple K were not reliable. In my experience some of the earliest guns had the poorest fitment. Loose slide to frame fit and with the back of the slide hanging past the frame not flush with the frame. These were guns with four-digit serial numbers with no letter prefix. During my quests for Combat Masters all around Western Washington I got to meet 3 former Detonics employees. One was the head pistol smith, and the others were production guys. One of those fellows worked with a famed shooter and pistol smith named Richard Neimer who worked at both Detonics and Olympic Arms before his sudden passing. He relayed to me several stories about Detonics and its demise. Detonics are great guns when you find good ones. Look for the proper fitment. If you find a nice one for under $800 I would recommend buying it. The inflated prices that you see are because of one guy in Texas that bought up a bunch of them during the time I was acquiring mine, but that is another subject that would be much lengthier. The word from the guys in the know was the best of Detonics production were with guns serialized CR17xxx and above. As far as mine are concerned I have nickel, carbon steel, and stainless-steel models for sure. I may have a hard chromed model as well, but I never tried to identify that for sure. As mentioned by one of the other commentors not all roll marks were well done. I've only seen one MK IV that was clearly stamped, and the bluing did not really differ from the 3 blue ones I have so I have been a bit confused if mine are all MK I's or mixed. My serial numbers are prefixed in "I", "C", and "CR", they have all functioned well for me. I have six Seattle marked guns. One Bellevue marked gun and Two Pendergrass; GA produced Combat Masters. They may be the best of the lot. One is a two-tone model that I have shot numerous times with no issues. The other is LNIB stainless, I've only shot twice, flawlessly but I've leaned towards preserving that one because of its high condition.