I have several shotguns with LOP a bit too short for me which also need a little more cast and more drop. The Beartooth slip-on recoil pad, which comes with 4 foam rubber shims of thickness varying from 1/4 to 5/8 inches, has proved very useful. Increasing the LOP will, because it moves your face back on the stock, also increase cast and drop. This has been just the ticket for me. Further, using a slip-on pad which is easily adjustable allows you to shorten LOP to account for a heavy coat, as with hunting in cold weather.
Of course all of this us useful only for increasing LOP and increasing drop and cast. Decreasing LOP would require shortening the stock. There are pads available for raising the comb or adding width (ie decreasing existing cast).
