"off the shelf" bsa/b-square or nikko Stirling are a bit lower than medium sports match. If you need lower than that it's custom jobs! I've got some custom super super low mounts for an ev2 but they're 25mm. There's a picture of them in my album. The super low 30mm ones in the other picture went with my ev2 when I sold it!
Rick Ardern. RIP mate, never ever forgotten!
Currently in stock........
Steyr LG100 x2, Ripley AR5S x3, hw77 x2, hw80 x2, hw100, hw97, hw98, Walther Dommie, Walther LGV, Stoeger x20s .22, Daystate mk4 in a custom laminate stock, Diana mod 50 + Gamo compact & Röhm twinmaster pistols