Weaver has it right. - Weaver Extended Multi Slot Bases

If you are considering this scope base, you are definitely on the fast track to building an accurate rifle. For a long time there has been a debate over "One Piece" or "Two Piece" scope bases. Those in favor of two piece bases have two basic arguments: Improved access to feeding rounds into the rifles internal magazine; and, Lighter weight. For the "old school" shooters, these were valid points for many years, I certainly was a follower of that line of thinking. But gun design has come a long way and it is time to rethink old conventions. Weaver has made a high grade aluminum base with trademark Weaver style slots that allow for an added range of ring placement. Its light, and has a clearance cut to facilitate top loading your rifle with minimal obstruction. (This is more or less for those that have not seen the future and upgraded to "detachable" box magazines on their bolt guns.)

Let's be clear. Two piece scope bases limit the range of scope placement for proper eye relief. In order to avoid having an uncomfortable "spot weld" of your cheek to the stock, you need to have the option to mount your chosen scope in an appropriate position relative to your desired eye relief. A one piece base simply makes mounting a wide range of scopes possible. Likewise, having the option of moving the forward scope ring ahead of the barrel/receiver junction is becoming necessity necessary due to the use of high magnification scopes for target and tactical rifles.

Weaver has addressed these needs with a very well machined product. I found my base to be a very precise fit to the mounting screw holes on my gun's receiver. I very much appreciated the fine recoil lug machined into the bottom of the base to minimize the shear forces of recoil upon the mounting screws.

Overall, Weaver has made (IN the USA) an excellent product for a good price. I have bought more than one set of bases for my rifles and will consider it to be a first choice on future builds.