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"CNC" can mean a lot of things and does not necessarily mean it is a quality product. It is not hard at all to CNC machine die-cast monkey metal. It is not uncommon at all to die-cast the basic shape of a product from crappy zinc aluminum, and then use CNC machining to finish up all the finer details to get the clean lines, such as hole placements, serrations, engravings, etc.
It is very important to also look at what the stock material is that is being "CNC Processed." Granted, a partially CNC'ed part would have cleaner lines and more consistent production compared to a fully die-casted product, but if you're comparing a receiver that is fully CNC'ed from a forged billet of 7075 aircraft grade aluminum versus a receiver is a "CNC finished" die-cast block of zinc-aluminum, then you are merely comparing apples to oranges.
Otherwise, "CNC" is just a marketing term.
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