The Ruger 10/22 does not have a dovetail. The receiver is drilled and tapped for a myriad of scope bases. And actually the last one I bought included a Weaver style base. I had an all original 10/22 from ~1967 that had a dovetail attachment in the box. But my comment was in the modern context, and there are almost none that have milled dovetails.
Again, true, and I thought that it was extremely stupid that Ruger never milled in their own mounting system to make 'it' more popular. Everyone leaving everything to someone else started early.
 
Run hat you like.
Anyone who thinks or say's dove tail wont hold on high recoil rifles is NOT using BKL's.
With the self centering BKL's once torqued down correctly you can remove the (tightening) screws and it wont move at all on an RWS48-54 or anything else. Remove scope and beat rings with a rubber matte so hard you damage the rifle and they will Not move.
Perhaps they do not have exactly what you need but if they do the very best every made in America rings ever.

John
 
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The Picatinny rail raises the scope,makes it easier to change scopes. Dovetail is alright if I use high rings and do not intend to change the scope.
.Another problem with dovetails is too many times they are not machined deep enough ,straight enough,etc
So in the end, though dovetails may seem like a simple way to mount scopes, too often they can cause problems.
When using dovetail mounts it is important to use really good strong rings.