I don't have Kenyon, but I'd interpret the seller to be saying that the commercials were made from parts. Just like "shooters" are made from parts. We, or at least I, generally refer to Commercials as guns manufactured for the commercial market, not mismatched military guns being given some lipstick and then sold off after the war.
Parts guns is parts guns, and if that is what you want, fine, but don't pay a premium for one.
dju
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