Get the utg scope mount. No drilling holes needed. I wouldn't ever suggest taking the barrel off of the original receiver. It very hard to get the headspace right.
If you wanna see what it looks like installed, take a look at my album.
Guess I am not understanding........... are you needing another receiver? If so I have a couple of polish M44 mosin nagant stripped barreled receivers. If one of these would help email me at craig_houchins@hotmail.com
I've checked other forums and some guys suggest removing the rear sight (2 pins, rail underneath), clamping on some high-rise 3/8 dovetail rings, and using a LER scope. It's a non-destructive setup. I've been thinking of trying it out on one of mine.