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For a very cheap gun, the Harbor Freight "purple" gun gets good reviews. It's this model:http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=43430I use it for epoxy primer. If you're looking for just one cheap gun to shoot primer plus paint, I would recommend the Astro LVLP Evo 4014. On the auto body forums it comes highly recommended and it uses less air (LV vs HV) so that it can be used with smaller compressors.http://www.spraygunworld.com/products/Astro/Astro%20Pneumatic%20-%20EVO4014.htmJust my Travis72 Cuda
I bought a Develbiss Starting Line gun kit with the metal cups and I love it. Only cost $125 from my local paint store and has both a full size and touch up gun and two tips and needles.