There are two ways to powder coat a gun barrel. The first way is to disassemble the gun and remove the barrel. Then, you must sandblast the barrel to remove any existing coatings or contaminants. Next, you will apply a powder coating primer to the barrel. Once the primer has been applied, you can then apply your finish coat of powder. The second way to powder coat a gun barrel is to leave the gun assembled and simply hang the barrel in an inverted position so that you can powder coat it from all sides. This method requires special attention to detail to avoid getting any powder coating material inside the gun itself. Whichever method you choose, be sure to follow all manufacturer’s instructions for the best results.
Matthew Edited answer July 29, 2022