Are you talking about O/U shotguns without side ribs?
Unlike rifles with one piece stocks that may provide support for the barrel; typically, the fore-wood of the shotgun is there to give you something to hold on to other than a hot barrel. Most double barrel shotguns are joined at the muzzle with a connecting plate, or gusset. Then, the longitudinal void between the barrels is covered by ribs. Several designs (including the K-guns) just use a simple hanger between the barrels and omit the side ribs. This has a couple of advantages, without the side ribs; the gun is a little lighter, has better cooling and is easier to re-regulated than a conventional fully-ribbed design. If the barrels of your Citori don't hit the same spot at a given distance, you're basically out of luck; but, with a divorced barrel gun, re-regulating isn't a huge problem -- just adjust/change the hanger.