You would be correct Ron. The upper is not the firearm. The lower is, which is why you can buy uppers and have them delivered to your home. I didn't think about TIG welding, but I would think you are correct there too (as far as welding). That said, I BELIEVE (but certainly can be corrected) that there is a special hi temp silver solder that is approved to fill in the pin after it has been set. Doing it that way alleviates a whole bunch of sanding /smoothing. Hi strength glues are definitely NOT allowed.
Was I right in the rest of my estimations?
Da 
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