That we will.
Rails depend on how you sight down the marker. Not all stocks give you enough mask clearance to get a clean sight down the "iron sights." If you get a raised rail you have to crane your neck over the stock. An offset allows you to keep your head in a more neutral position. It's a matter of what feels comfortable. I don't like bending my head over a marker so I got a dogleg stock and a normal rail.
Of course, if you don't have a stock, you don't need a special rail.