I have used these dovetail to weaver mounts on various rifles, mostly for NV gear, & can thoroughly recommend them !
They are the very lowest available ('least riser') and fit very securely to @ 11mm rails.
http://www.opticsplanet.com/b-square-air-gun-adapters-risers-3-8-to-weaver-adapter-2-piece-base-blue-17025.html
Obviously, you'll need to check your rifles' mag. clearance height because these only add a few mm to the mounting height.
They are the very lowest available ('least riser') and fit very securely to @ 11mm rails.
http://www.opticsplanet.com/b-square-air-gun-adapters-risers-3-8-to-weaver-adapter-2-piece-base-blue-17025.html
Obviously, you'll need to check your rifles' mag. clearance height because these only add a few mm to the mounting height.