The main issue mounting a scope is the proper height rings/mounts, when I had a 44mm objective lens scope I bought medium size mounts 15.5mm from rail to bottom (where the scope sits) and I didn't have enough clearance to mount it so I had to put the mounts on a riser block, which gave me clearance but more importantly (for me anyways) it gave me the proper height to allow me to get optimum view down the scope, maintaining a positive cheek weld and without straining my head to the rifle, allowing for correct posture (I only shoot offhand) I have recently put a smaller scope on but still use the riser, it makes target acquisition more immediate and comfortable and repeatable......google is your friend in this instance.