Manual rivet guns work. Nobody is disputing that. But "works" is a low bar for a tool you're using forty times on a duct panel in August, or flat on your back under a trailer hitch, or one-handed on an HVAC run where your other arm is already doing something else. The squeeze-and-reset cycle of a manual riveter is fine for three rivets. It becomes a tax on your time and your grip past a dozen.
The category has a second problem, which is cordless riveters that solve the fatigue issue but create a new one. A lot of them are battery-specific, meaning you're either buying into a whole new platform or hunting for a charger you don't own. For someone already running Dewalt 20V across a job bag, that's not a minor inconvenience. It's a reason the tool never gets purchased.
What brushless actually means here
The brushless motor distinction matters more in a riveter than people give it credit for. Brushed motors wear at the carbon contact points, run hotter under sustained use, and get louder over time. In a drill you might not notice for years. In a rivet gun running a continuous job, you notice in an afternoon. Brushless means the motor drives magnetically, no physical contact between the rotating parts. Cooler operation, quieter pull, and a service life that doesn't quietly degrade after the first hundred hours.
For HVAC work, RV panel fabrication, or any job with a long uninterrupted rivet run, that cooling difference is the one that earns the tool its permanent place in the bag rather than the shelf.
The other mechanical detail worth understanding is nozzle-swap logic. A lot of riveters require a separate wrench to change nozzle sizes. This one uses the reverse mode to unscrew and seat the nozzle directly, which means swapping between 1/8", 5/32", and 3/16" is a one-handed operation with no loose hardware to lose on the floor of a work van.
The version we settled on is the Cordless Brushless Rivet Gun in the Dewalt 20V format, and the reason is the ecosystem fit. If he's already running Dewalt, this tool slots in without a new charger, a new battery, or a second thought. The operation is one button: cycles through riveting, nail break, and retraction automatically. Center position locks the tool so nothing fires in transit. A jammed rivet ejects in reverse mode without reaching for another tool. The rubber grip, the on-body battery indicator, the integrated LED, all of it is there without being over-engineered. Twenty starter rivets ship in the kit, which is enough to verify the fit before committing to a supply run.
It's the kind of tool that works well for the weekend fabricator doing one project a year and equally well for the guy who picks it up six days out of seven. The use case scales. The learning curve doesn't exist.
For the person who already knows what a rivet gun is and has just been putting off getting a good one, this is the version worth stopping on. Worth handing over.