I have a Rossi single shot 20 gauge that I hadn't used in a while and decided to make it a bit more interesting. You can use any old single shot, or any firearm for that matter.
Things you'll need:
1. Four different colors of spray paint in a matte finish, preferably those that best match your local woodlands. I chose olive, tan, green, and brown.
2. Protective Matte Clear Coat.
3. Painters tape.
4. Wax paper.
7. A firearm to paint!
8. A whole ton of patience.
Disclaimer: I am not responsible for any damage, loss of value, or voided warranties. You attempt this at your own risk and understand that I am not responsible for your actions. Always obey local, state, and federal laws when working on a firearm.
Step 1: Prep Work
First off, make sure your firearm is unloaded and pointed in a safe direction. Now that that's done, we want to remove as much surface oil as possible so that the paint adheres well. I accomplished this by repeatedly rubbing the shotgun down with rubbing alcohol and allowing to air dry.
Next you will want to tape off or remove which ever parts that you do not want to paint. I chose to tape off the hammer/ejection lever, trigger guard assembly, and sling mounts. I also removed the rubber butt pad.