You will want the cantilever to get the proper eye relief. I had that scope on my wife's AR for a short time. It would have been much better with the off set, but worked ok with regular rings. But her's is a high rise receiver and the high rise mount wouldn't work, too high.
For this application, I would certainly look into the cantilever RRA mount. With the cantilever, you can always set the scope further back, with out it, it will only go so far forward.
Just my $0.02.
