If you want to go the 45 degree offset route, you will want to
offset mount it forward of the ejection port, and ejection
port cover. Or use the mount that clamps to the scope body.
I am not fond of that system, since it puts stress on the scope
tube, and for me, it gives the rifle a top heavy feel.
I prefer the 45 degree mounts, that can be mounted forward of
the ejection port, but this requires a railed forearm.
FWIW, I started down this road, and decided the whole red dot
next to a scope is just another sight that can have issues.
I now have two 5 slot YHM 45 degree mounts, one behind the
scope, and one at the gas block end of a midlength quad rail
float tube, with Magpul MBUS flip up sights. So when things
are too close, and moving fast, for the 3-10x Bushnell Elite,
tip the rifle 45 degrees, lock on with the Magpuls, and the
target has a bad day.
Squeeze