Originally Posted By Lem:
Back before there were flat tops, we milled a flat & bolted a scope base on.
One of the big issues when you did this job was the stresses in the upper. When you cut through the first leg of the carry handle, the cut would open or close. One some the cut would spring open .200 or more - always worried me that the carrier bore was no longer straight on those.
The Redfield base for the 336 was always a good choice, but it was best to open the holes up & use 8-40 screws in all 4 holes. A real pain in the ass compared to buying a flat top today. The only reason I can see for this now would be a desire to have an upper without a brass deflector & forward assist.
I think now you can get new Flattop uppers without brass deflectors and forward assists. Don't know the company's name offhand; maybe there are more than one? ( Probably one or more of this site's sponsors...)