Quote Originally Posted by KMW1954 View Post
I put these base mounts on mine as the rings I am using are a Picatinny style mount. The rings would not work with the Weaver Style bases. They also offer them for the round receiver, part # is 410615

https://www.midwayusa.com/product/1008846990?pid=386926
Yes, need to be wary of the difference between Weaver & Picatinny, also called Mil-STD-1913 rail. They are close but not quite. While weaver rings will fit either style, Picatinny rings will fit only Picatinny rails.