How to Remove Rust from A Gun Without Damaging Bluing?

Once the metal has soaked, wipe one side off thoroughly with a dry rag. Now start working the polish into the surface with steel wool. Use a circular motion around each patten and pull hard enough to remove any rust but not so hard that you remove the bluing in spots. To ensure the barrel is clean, wipe it out with a rag soaked in WD40, then use another dry rag to ensure no Flitz is left inside. Using Flitz on a gun is a very effective way to remove rust. It also keeps the pores in the metal from becoming clogged so that corrosion cannot form later.

If you need to clean your gun, coat it with Flitz before storing and it will keep it protected until next time. However, if you choose not to use Flitz or other solvents, make sure you wipe down your gun thoroughly after shooting so no moisture can seep into the metal and cause oxidation/rust to develop over time. Allowing even a little bit of water into a gun can be detrimental because each shot raises the temperature of the barrel by about 60 degrees Fahrenheit (16 Celsius). It can be too much for unprotected steel to handle.

Removing Rust from Gun With Home Electrolysis 

The first step to removing rust from a gun without damaging the bluing is to clean it off as much as possible. At this point, you will notice that there is still some rust on your gun. You should have a stainless steel container and an electric motor or drill for powering the process. Fill the container halfway with water that has been distilled by running through a coffee filter (or another filtering system). Insert your part into the solution, connect your power source to the positive terminal of the said solution via copper wire, and use another piece of copper wire as a ground, connecting it to either side of your container.

As stated before, connect one end of your power source via copper wire to any part of your gun that does not have bluing (for example, the handle or butt of your rifle). After that, you should be complete with the wiring in your solution. After this step, stir the solution rhythmically to ensure a constant current is running through it. Do this for as long as needed, but approximately half an hour would suffice and yield great results. At this point, you will notice that all rusted areas have disappeared, and only pure steel remains on camera metal surfaces. You can stop here if you wish, but there may still be some rust increases in your weapon.

Therefore, submerge the whole thing again into another container with more water and alcohol; mix 1 part alcohol to 4 parts water into a holding tank such as a glass jar or plastic tub. This solution is used to remove the rest of the rust, so just let it sit for a while longer. After this, you should notice that there is no visible rust on your weapon at all and only pure steel remains. You can dry it off with a rag or leave it as is if not using right away. Then use white fine-grit sandpaper (220 grit sandpaper) to lightly buff down any scratches left behind by the wire brushing to make them less noticeable when looking down the barrel of your gun.