Sold all but one air rifle and bought this R9. I started it off with a 2-7x32 Hawke in low rings. Here is my upgrade, 4x28 FXI Leupy in medium rings. Because sometimes less is more 
In case you are looking at these low Hawke rings for an R9, it is only marginally better than the irons for the comb height. Medium hawke rings with 25 MOA inserts are just right
No droop on this gun, but this should get me dialing down to zero at 50 yards. I will explain more about that down the road 
In case you are looking at these low Hawke rings for an R9, it is only marginally better than the irons for the comb height. Medium hawke rings with 25 MOA inserts are just right