Well, this is the handgun section, so I assume you'll be doing it to a pistol. For a revolver, they typically just port the barrel. Magnaport has been in the business for years, and they know how to do it right. They can do porting on a rifle, as well, but for a rifle it's actualy better to have your muzzle threaded and install the MagnaBrake. It's more effective and doesn't involve putting holes in your barrel. For an autoloading pistol, there are a few options, including longer barrels with ports or replacing your bushing with a compensator.