Originally Posted by SPEEDY
I should have mentioned that the scope I have is the Leupold Mark 4 M3 long range/T 3.5-10X40 with the TMR reticle.
Yup... you should have. Actually, you don't have a MK4-M3.
You have a Mk4 LRT, with a M3 elevation dial.
The MK4-M3 is a unique scope like none other. It shares NOTHING with the other scopes in the line - but some other scopes in the line can be had with the M3 elevation dials from the original M3-LR (long range)... not the MK4-M3, whose dials are also unique to that scope.
You need a tapered base.