The Savage 110 debuted in 1958-59 and so has been around a very long time and has seen quite a few variants along the way.
There were some years that Savage produced the 110 with the integral rail as a solid piece on the receiver. Those particular years were not drilled and tapped but rather had Weaver style bases cast, or milled as part of the receiver. It was in the mid 80's when Savage was in financial trouble and they probably did this as a cost saving measure.
I own one like I just described above - I purchased it in the mid '80s.
It still remains to be seen whether the original poster has removable bases or the type I have. He hasn't returned in quite some time.
Last edited by 8mm/06; 09-03-2012 at 11:41 AM.