I have a belt driven stationary compressor, a PC large bulky portable air compressor on wheels to run an air chisel, but I'd like to get a lightweight portable air compressor that I can carry to run a framing gun on occasion. I am not a contractor, I do Handyman work on the side so it's a variety of small jobs. Because I won't use it very often I want to keep the cost down. I'm thinking HF Fortress but don't want to waste my money. I need help with specifications. I'm not sure hp, psi, scfm @ psi, and gallons that I'll need to run ONE framing gun. I have a job coming up to frame in and close a not needed basement door opening.