I just bought a Mossberg 930 I haven't even shot it yet lol. But I get where you're coming from. I won't put up with my head floating around behind a raised sight. In my case it's a red dot but pretty much the same problem you're dealing with.
Beartooth 2.0 makes a nice comb raising kit. It's a bear to put on and get right but once on it's nice. But as you can see I bought a pistol grip stock and the beartooth just flat won't work.
So I had to make something that worked for what I needed. I ordered a sheath of 1/8" plastic from Amazon. I then made a template from printer paper and cut it out on the plastic. Heated it up in my wife's oven and moulded it to the gun as you can see. Then mounted it with 2 screws each side.
I know it's white lol. I painted it getting it ready to hydro dip but my kit didn't come today
. Should be here Monday I hope. Then it will better match the gun. It works perfectly and is very solid. When I shoulder the shot gun my eye is lined up perfectly and I have a solid cheek weld.
Hope this helps maybe gives you an idea or ideas
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