11MM Dovetail – 20MM Scope Rail Converter Adapter for Telescope

Our Take

An 11 mm dovetail to 20 mm rail converter — the standard bridge for putting a modern rail-clamp optic on an old dovetail airgun or rimfire. 69 x 20 x 11 mm, about 90 g, metal. The ‘for telescope’ in the title is listing-speak for scopes; ignore the wording and look at the numbers. The real question is which end matches your gun: 11 mm dovetails are cut at slightly different angles across manufacturers, and a tight fit matters more than any other spec here. A loose converter creeps under recoil and you’ll chase your zero all afternoon.