@AmEngRifles
If you want to fabricate a part on a specific CNC machine you'll have to design that part from the beginning to be compatible with that machine.
These sublime devices are not magic wands that can spit out any random shape or form, they have their limitations too.
Being designed almost 100 years ago, we can be absolutely certain that the BREN was not intended to be produced using CNC machines.
Besides, I would expect the cost per unit for producing just a handful of parts this way, as opposed to thousands and thousands, to still be horrendously high.
And with thousands and thousands of perfectly functional BRENs being destroyed because nobody wants them anymore, why bother?