I had a T/C Hawken hunter recoil proof scope on my 535 that had 6" of eye relief. The scope was a 1.5-6X32, and if I hadn't put the knoxx stock on my shotgun, I would probably still have that scope.
I changed to a mueller quick shot due to the unlimited FOV and unlimited eye relief. I haven't had a chance to test it yet, but from all I have seen on here, it's a great little sight.