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Fit an 11 mm dovetail optic to a Picatinny accessory

How to run a Picatinny scope or red dot on an 11 mm or 3/8 inch dovetail airgun or rimfire.

Needs adapterAn 11 mm or 3/8 inch dovetail needs a dovetail-to-Picatinny adapter base before a Picatinny optic will fit. The adapter clamps the dovetail and gives a Picatinny surface on top.
OpticPicatinny scope or red dotPicatinny mount
interface
Mountdovetail to Picatinny adapter base
seats on
Rail11 mm or 3/8 inch dovetailclamped groove, 11 to 13 mm range
Fit readoutBench figures
Fitment
Adapter
dovetail to Picatinny adapter base
Check
measure the groove, 11 to 13 mm varies by maker
Recoil
spring air rifles recoil both ways, use a scope stop
What to fit it with
Search Amazon for 11mm dovetail to Picatinny adapteraffiliate searchFind 11mm dovetail to Picatinny adapter on eBayaffiliateSearch Amazon for dovetail to Picatinny adapter with scope stopaffiliate searchFind dovetail to Picatinny adapter with scope stop on eBayaffiliate

A dovetail is a clamped groove, not a slotted flat, so a Picatinny mount has nothing to lock into. Fit a dovetail-to-Picatinny adapter base first: it clamps the 11 mm or 3/8 inch dovetail and presents a Picatinny surface for the optic.

Measure the dovetail before buying the adapter, since the real width runs from about 11 to 13 mm. On a spring or gas-ram air rifle the recoil moves both ways, so use an adapter or ring set with a scope stop or arrestor pin to stop it creeping.

Related fitments

Sources: 11mm and 3/8in dovetail interchange, Pyramyd Air · How to measure 11mm, 3/8in and 13mm dovetails, RimfireCentral · MIL-STD-1913 Picatinny rail dimensions, Wikipedia