change nuke ops marksman rifle to a bolt-action

[Azurnite]

I think the tracer idea would be a good start. So firing their weapon does at least reveal their position to anyone trying to take them down rather than just death coming from an unseen source.

I totally agree with this. While not the nukies sniper, I remember this was a thing I kinda wished for personally during a couple of Cogwerks's planet-station events (terrainify) where there were snipers in the woods outside the station. Tracers not only hint at the location, but also do a bit of psychological attack from just seeing the bullet whizz past you.