this is the one I have, its great for sheetmetal & up to 1/8 in . they say 3/16 I would say it's a little slow with 3/16. In sheetmetal it has a narrow kerf & gun is easy to handle in detail work where a larger gun is clumsey and kerf is wider. for body work this is the one!!
http://cgi.ebay.com/MILLER-SPECTRUM-...item53dc6ea51a