I just bought a bushnell scope for my older savage .22. It came with the rings. I was going to go buy a base until i sat the scope on the gun, just to see what it looked like and noticed grooves machined in the barrel right where the scope should be. So i put the scope on and tightened it down.It is very solid, a perfect fit. My question is , is the grooves a base for a scope,it seems like a perfect fit. Ive never really mounted a scope on a .22 so i didnt know if it was normal, or do i still need to buy a base for the scope.