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A few thoughts on this, since I spent a portion of my career working with Instrumentation and Automation at facilities that did a lot of R&D. I have been around a lot of high vacuum equipment. If the oil used in their high vacuum pump is something like Fomblin, its super expensive. Plus doing high vacuum work is something that takes a while to learn, there are a lot of nuances to this equipment along with safety concerns.
What is see as the biggest stumbling block is the gun assemblies, I do not see them as being something that can economically produced in limited quantities due to the specialized equipment and materials required. Sadly I imagine that much of this equipment no longer exist in the western world and some of the materials used may be difficult to get and touchy to work with due to toxicity.
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