For the green liquid, I made greenish white circles (hollow cylinders) in a green transparent cube. I added some glow and incandescence to get a decent glow look to it. Then when I applied the texture to the model, I added a ramp node to add a small glow to the top and bottom edges (although, it doesn't show in the small gun render above - I'll have to increase settings for small renders). I also made the liquid filled cylinders a little translucent with a point light inside (which also doesn't show up in the small render-hmm).