When sourcing nail guns, you must first identify the power source: Pneumatic (air-powered) is preferred for high-volume production due to its reliability, while Cordless (battery-powered) offers mobility for onsite work. Pay close attention to the magazine angle (typically 15, 21, 30, or 34 degrees) as this determines the type of collated nails required. Ensure the tool features tool-free depth adjustment for precision and a selectable trigger to switch between sequential and bump firing modes. For durability, prioritize models with magnesium housings and hardened steel driver blades.