Curt,
I tried to get by with some standard 50mm rings setting on my flat-top upper, but it didn't work out. /ubbthreads/images/graemlins/smiliesmack.gif
I recently purchased the High Rise 1 Piece Mount, for my RRA A4 and I love it. /ubbthreads/images/graemlins/grinning-smiley-003.gif It's $47 on RRA's web site, $41 on Adco Firearms' web site, but I found it at a local gun shot for $29. /ubbthreads/images/graemlins/grin.gif
Send me an e-mail and I'll send you a couple pictures of it. This message board has a limit for the amount of pixels that can be posted, so I can't post the picture here.
Good hunting, Bowhunter57