When I told my wife that I was going to go buy a part of off Gunny and she asked "Who is that?" I responded, "Probably the nicest guy on MIA. I mean most everyone is cool, but he's just THE nicest guy." An all around trustworthy dude.
I bought a ProWin Hop-up off of Gunny. He offered to drive almost all the way to my house to meet up, but I wanted to go out to the bar in his area anyway so I met him at his house. Super nice guy and the part is as described for a reasonable price. A+
Shameless plug for my airsoft chrono calculator, useful for converting Joules to FPS/MPS and determining what FPS difference there would be assuming no loss or gain to Joule creep.