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I need a rear micrometer sight for my Anschutz 1813 (11 mm dovetail.....)

Can be old, can be cheap....only need it for fifty feet.....

Here's one (not old, not cheap, though):
http://www.pyramydair.com/s/a/AirForce_ ... ifles/2237

There are more here:

http://www.pyramydair.com/a/Accessories ... _sights/71

Most air rifles have 11mm dovetails.