Since nomad guns are practically big blue jelly domes, I'd imagine the human and wilde counterparts to be a bell of a lot more complex than growing them.
There has to be some sort of ingenuity to not only grow the weapon segment, but it has to be coaxed into growing specific parts. Maybe the reason why the guns still have a human model is because the inner workings have to be augmented by electrical probes, guide rails, adapted power modules etc-- and probably why they're a hell of a worse than than the originals in terms of performance. Difficult to grow, difficult to use, and not practical.
So think of them as "A living thing specifically bred and trapped and enslaved in a metal cage, forced to do whatever its told by being electrocuted." But whatever, its not like these things are sentient, practically like growing a flower using selective breeding.