I've had a few of the Higgins also. As has been stated, these were put together by High Standard using FN actions and the scope mounting holes on the bridge can be either .50" or .860" spacing. The one I have now came with a Higgins marked scope and mounts made by Kesselring, I believe. The mounts look a bit like Weaver but are not interchangeable. I have used the Warne as well as Talley detachable bases but I could get the scope mounted lower with the lowest Weaver rings; something I couldn't do with Talleys. This may not be an issue for you but it was for me with the early low-comb stocks issued from the factory. I, too, would second the addition of a Timney trigger but a great rifle to build on!