could use Gimp or other soft to make an alpha image
and just add the text in black or whatever color you want
add it to a plane if surface of gun is totally flat
if not need to subdivide planet a lot then can use shrinkwrap
connect the alpha input to the alpha socket on the other node… and i recommend you to add a bump map node and connect a b&w node before the bump, and then connect the image there (the bump map must be non color data, but to not having to duplicate the node for one with non-color and another with color, just instead use the b&w node) and connect the normal input to the normal socket of the principled node…
i am up to the task, here is the catch, do you have a dead line for this model? Cuzz am kinda busy too, and I think its better to do it your self and learn new tricks.
If you want me to do it, plz notify me, or task it to others.
If you want to do it your self, kindly follow this:
new trick
add text object then convert it to mesh.
then follow this: