Him the CNC owner.
Seems like if every guy owns part of the gun, there really can't be any issue that you're not doing work on your own gun.
If they are manufacturing firearms with the intent of selling off their ownership of said firearms,
Could be... but...
It might be even simpler, it might be that only the one guy (programmer) needs to have ownership interest in each gun.
He can pay 1 cent toward each lower.
No need to "sell" his interest. He forever owns a 1 cent share of each gun.
Still happily answering to the call-sign Peetza.
You do not HAVE a soul. You ARE a soul. You HAVE a body.
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.