There were many different people making the masters. Jack Sell, the original owner and founder of Combat Models, to the best of my knowledge, made his own masters. He only produced a few kits before the company was sold to John Rucks, who was the owner of Combat for several decades. John sourced his masters from all over, using many different pattern makers. Because so many different pattern makers were involved, it is impossible to comment on the general accuracy of Combat Models kits--if a particular kit was mastered by a very good pattern maker, it was likely to be fairly accurate. John was also fond of "cloning" (i.e.--stealing) the work of other kit makers. I know for a fact he stole from AirModel and Contrail, and almost certainly from others. Any of the "cloned" Combat kits were inferior to the original manufacturer's kit--that is a given when making molds using fourth generation source material.
Another factor that must be taken into account when discussing the quality of Combat Models is the quality of the production molds. As time went on, John seemed to be less capable of making decent production molds. I am not sure why that was, but I suspect it was a combination of failing health and eyesight and poor mental attitude (he was tired, bitter and burned out--quality was not a priority for him). Given all that, even if he started with an accurate pattern, by the time the production molds were made the potential quality of the kit was already severely compromised.
Another factor affecting the quality of Combat Models was in the vacuform machine used by John. It was an ancient, worn out machine that had already had a long life in an industrial setting before he acquired it--in short, the machine itself was incapable of producing top quality work even if he had been using it with top quality molds made from top quality patterns.
Last factor was his shop environment. It was a damp, dusty garage. Plastic was bought "as needed", and if sales were slow it could sit for quite a while before being used to make kits. Old plastic stored under poor conditions such as those found in John's shop will get dirty, brittle and absorb moisture, and all that will affect the quality of the kits. In particular, plastic with high moisture content will produce poor clear parts--something very common with Combat Models kits.
The above 2 paragraphs possibly only apply to the Combat Models kits produced by John--I do not know the equipment or shop environment used by Roberts Models.
Robert (of Roberts Models) originally produced detail parts for John Rucks' Combat Models. After John passed away, Combat kits were available as special order items from Barry Stettler of Roseplane Hobbies. Ownership of Combat Models eventually passed to Roberts Models.
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