Knocking out pins and moving sights is the job of the punch, which comes in steel, brass or nylon. Steel punches are used most often to drive out pins. Since brass punches are softer than gunmetal, they’re typically used to adjust iron sights to avoid marring the finish. That said, try to avoid “brass tracking,” the unsightly marks left on a firearm’s finish when the punch slides across the surface. If this is a concern, a nylon punch may be the best option.