[tyingq]

"since it looks like a gun"

There are models that don't.

https://www.homedepot.com/p/Ramset-HammerShot-0-22-Caliber-S...

[benj111]

It basically is a gun though

"this technology relies on a controlled explosion created by a small chemical propellant charge, similar to the process that discharges a firearm"

https://en.m.wikipedia.org/wiki/Powder-actuated_tool