Stupid question:
What are the best paints to use on this?
Do you prime first?
I'm far from an expert, but I'll tell you how I did it. Naturally, I pulled the gun apart into it's various components. Take a picture of it so you know where everything goes.
I then sanded it back to remove the nerf & maverick logos and then wet sanded it to make it as smooth as possible.
Sprayed with grey primer, though I guess black would be ok too.
I then wet sanded that again and gave it another coat. Later I added the base coat of metallic blue and wet sanded it. Another coat and then dusted it in patches with some metallic silver.
I masked off the handle and sprayed it black.
When it was all dry I washed everything in black and wiped it away so it stayed in the cracks. I did that a few times and then did a very thin wash of brown.
Once all that was dry I started dry brushing in silver on all the raised areas. I also added some brown to the handle and tidied it up.
To weather it I dabbed it with very light brown on a large brush, barely containing any paint. I also used the dusting technique with flat black paint where you hold it a good distance away and just do little 'puffs'. That turned out great.
Coat of flat clear and screwed it all back together. You have to make sure you don't spray the moving parts or you'll end up with it not firing. You'll probably also get some paint wearing on the trigger.
As for type of paint, I just used spray from Bunnings. Primer, metallic blue, chrome and flat black. The brown was just a tube of acrylic art paint I had lying around.