What differences keep .22 blank-powered nail guns from being classified as firearms?

[winchman]

I'll tell my wife to buy some extra coffee. If the feds come to our house, they'll dang sure need it....

[winchman]

The line launchers I've found are either ridiculously expensive or have been out of stock for a long time.

The dummies for the dog training...

[winchman]

I'm thinking about making a line launcher powered by .22 blanks by modifying a used single shot rifle. I've noticed that the blanks for the nail gun...