Rather interesting development - http://www.rowanengineering.com/products19.htm Shortly to be available 'worldwide'. Which might appeal to some Target (but probably not allowed for Match Target) Shooters :-)
according to this website (who sell quite alot of FXs):- http://www.airgunbuyer.com/webnews.asp?ID=880 Looks like it might be a winner at those sort of prices.
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...