I'm looking at the PRI uppers, the 3 gun in particular seems like it would be a great buy. I talked to PRI today and they said it is a Douglas barrel they are using with the SPR contour and they are pretty flexible with available options.
http://www.precisionreflex.com/Detail.aspx?PROD=274249&CAT=4214
http://www.precisionreflex.com/Detail.aspx?PROD=274249&CAT=4214