Looks like my EFS 5.5" gun. The EFS sight can be seen from the top. Look at the two set screws in the sight channel. There is also some witness marks you line up.
Basically you loosen the two screws on the sight, slide it out about 3" and then tighten up the screws again. I am not sure how they mounted the scope and if they went through the sight.
I was faced with the same problem, so I just bought another 41 instead of tapping my EFS sight.
The bottom one is the EFS model. See the two screws? Ahead of the front screw you can see the witness mark in the sight line. It is about 3/4" of inch forward. You bring that forward to the witness mark on the gun.