There have been several topics lately about scoping the X-frame, and there seems to be a universal problem with keeping the screws tight. You will have no problem with putting on the mount yourself, but some are now being made that use 4 screws instead of 3, which will require a fourth hole to be drilled and tapped. I used a Weigand mount and a 2x Leupold on my four incher, and finally used a two part epoxy to bed the mount to the topstrap to keep the screws from loosening. My 8 3/8 version has the same setup, but with a 4x Leupold and I've never had a problem with it, so so far, no epoxy.