I bought this nutsert tool to use install my PSC body armor but decided to go a different route than nutserts. Its been slightly used, but in brand new condition. No scratches at all. It does need the mandrel head. This gun lists for 500 new. The heads go for 70 each. The 500 new includes 1 head. So 430 new with no head.

Here is a video showing how it works. Its a spin-spin tool.
http://www.youtube.com/watch?v=lYCDsTs-jtA&feature=player_detailpage
Here is some data on it from blue pneumatic.

Now with new swiveling air inlet and ergonomic composite handle. Technology and Production techniques makes this tool possible. This rivet nut tool is designed to fill the gap between the hand tool and the “big” high end production spin-pull tools. It offers a solution that is powerful, fast and affordable. It is durable and reliable, perfect for everyday production applications. The spin-spin action places Rivet Nuts ranging from 1/4-20, 5/16-18, 3/8-16 and M6, M8, and M10 in steel and aluminum. It has a quick change nose assembly that easily snaps on and off to change to desired rivet nut sizes. It has a teasing, reversible throttle for precise control. Operates at 360 rpm. Recommended operating air pressure is 85-110 psi. Weight 2.8 lbs

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$375 Shipped!!