Oh, one thing I forgot to mention: I removed the extra scope rail that is mounted to the dovetail on the receiver tube. I then took my 1-piece scope mount and tapped an 8x1.25 threaded hole through the existing set screw hole in the scope mount. This allowed me to take the larger 8x1.25 set screw I took off the extra scope rail and use it directly on the scope mount to the receiver tube. My experience has been with the original tiny set screw that comes with the scope mount to be inadequate for these high powered air rifles. I took off one set of rings one day and the tiny set screw was actually bent as the scope mounts started creeping backwards along the dovetail. I couldn't take the set screw out, so I just tapped the new hole right through it. With medium scope mounts, a scope with a 44mm objective bell sits 1/8" above the top of the receiver tube, leaving just enough room for a flip-up cover. I did this with all 3 of my CFXes. No more bent scope mount set screws and my scope no longer creeps backwards. And most importantly, no more torn set screw hole on the receiver tube.
