I am probably making a mistake but I'm considering swapping out my beloved USO SN3 3.2-17 for a S&B 5-25X56. My concern is mounting the S&B in an AI mount which is what I want to use. I seem to remember people having to machine the mount for it to work & I want to avoid that if possible. I have also heard that the new mounts are already relieved for this combo. Any input would be appreciated and I am sorry if this has already been covered. The rifle is an AIAE MKIII 24" Thanks Chris R.