Same type of question came up a couple of weeks ago. I have a BSA Sweet 22 3-9x40 and bought the UTG Med quick release rings. But they would not clear my MBUS either and I had to really push my check down to see good. So I got a UTG 1/2" riser and the MBUS fit under the scope and has a good feel when shooting with the scope, not too high or low. Also from what I found that the difference from low to medium and medium to high is only 5mm. I have pictures under the optics thread if interested, I cannot post them now.

Here is what I got:
Amazon.com: UTG Max Strength LE Grade Quick Detach Picatinny Scope Rings (2 Piece, 1-Inch Diam, 6-Screw Med Profile): Sports & Outdoors
and
Amazon.com: UTG Low Profile Riser Mount with 13 slots: Sports & Outdoors

Or you could try (this the other mount I was going to buy):
Amazon.com: NcStar AR15 QR Weaver Mount/ Cantilever Scope Mount Rear Ring/30mm and 1" Inserts (MARCQ): Sports & Outdoors