Home depot and other box stores have sold powder actuated guns for years. My grandpa got one from menards when I was a kid. I do believe that there is a license for those that use them everyday but don't believe it's required for the diy'ers. Think it's more of a company safety policy. I have one and use it for concrete. It has it's uses and disadvantages also. Depending on the hardness of the concrete it can blow out the concrete, that is when I use the tapcons. I wouldn't get the 20 dollar one that you hit with a hammer, I would spend a little more money and get the one with a trigger and looks like a gun. They are nicer to use and you can lean into them with both hands and body weight and not have to swing a hammer. In that way they are safer than the ones you have to hit with a hammer.