Hey I found this on the net. There is a way of drilling and taping and I don't want to change the gun. This sounds simple and doesn't change anything.
This is a quick fix I use for the front sight of the Mosin-Nagant 91/30 and all models of this rifles that you can use to solve the high elevation shooting problem these rifles have.
Basically you take a small piece of plastic tubing and slip it over the front post. It will need to be a tight fit so you can slip it up and down to adjust elevation
I used tubing that I acquired for making fishing lures. It comes in different colors and I used red. The size I used was OD =.106 and ID =.070. Cut a piece equal to the height of the front sight post. Use a hair dryer and heat the tubing then slip it over the front post. You can adjust it for zero by sliding the tubing up on the sight post. You need to raise the front sight to lower the elevation.
You can also use insulation from electric wire. You need the solid copper wire. Cut the insulation and slide it off the wire. You will have to use an ID smaller then the diameter of the front sight post so you will have a very tight fit. This insulation also comes in many different colors.
I have four 91/30 Mosin-Nagant that shot 8" to 9" high at 50 yds. and have used this method to adjust them to zero and also many of my shooting buddies rifles
I am going to try it with shrink tube for electrical work. Any other suggestions?