picatinny to 11mm weaver adapter
thingiverse
a simple picatinny to 11mm weaver rail adapter, i used it to mount a scope to my co2 umarex tornado. the printed version is an older one, this current one is a bit more flexible so you can easily clip it on. it's a friction fit with holes and sockets for nuts+bolts, to get the perfect fit you should file the surface down and clamp it on.
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