To expand on the idea that BoG documented above, here is how I went about the process of raising my HW77 front sight so that the irons are usable with the new high comb ambidextrous stocks.
I started with one of these Feinwerkbau risers
Using the shorter front base, I sliced it in half lengthwise using a cut off wheel in a 4 1/2 inch grinder.
I then cleaned up the cut on a bench mounted disc sander, and proceeded to file the cut edges to reduce the overall width to fit the dovetail width of the Weihrauch globe front sight.
The cut edges were reduced to the point that the Weihrauch sight would fit with a firm press of the fingers. No hammer or beater block of wood necessary, if you take your time and check your fit often.
DO NOT get in a hurry, use good sharp files in good lighting, and CHECK YOUR PROGRESS often. You are trying to sneak up on a good firm press fit with your fingers.
End result
I used an old Mendoza rear peep because of its beefy base and two screw securement so as to avoid the sight creeping back under recoil.
My HW77 is making close to 15 ft. lbs. With 10.3 JSB pellets, and the sight has held tight through a half of a tin so far.
The sight line is a little higher than I prefer, but the alternatives involved either reworking the factory stock, or buying a new stock.
Minimal outlay and some time spent fitting parts together avoided those alternatives and the head position with this set up is quite comfortable for me.
The Feinwerkbau risers were sourced from Nikkonos on the bay.
www.targets.ca
There you have it.