Hey Tyler,
The difference is about $220,00 dollars ! And what you get for it ?
I have an R-9 in .20 cal. and I love how hard it hits, and how accurate it is.
I did look at the R-11 with the adjustable shoulder pad and adjustable cheek piece, but it only comes in .177 cal. Not quite what I was looking for !
So for the $$$$$ savings, I bought a R-9, and have never looked back !
It is an absolutely beautiful and accurate air rifle ! And in .20 cal., all I need .
Bill