Originally Posted by edge
I do not have one.
Other than a quicker acquisition of the target while you set up what is the advantage of one on a rifle with a scope?
edge, Most stocks for rifles made here (US), are set for 1" scopes, if you go to a 30mm tube scope, the stocks' cheekpiece will be too low for it, so you'll have to slide your face up a little to see centered through the scope. Since your cheek is therefore not "welded" in the same spot every time, your accuracy suffers because your line of sight will be a little different each time. Also your head/body position is a little different with each other so the cheekpiece needs to change a little for your position i.e. standing. sitting, prone, etc.
If you get a 20 MOA scope base or shim your rear base for long range shooting, this situation is magnified.