I am using that mount.
At this point I have only spent about 4 times as much as the rifle itself. But it is more fun to build up a sporter IMO. Especially one that shoots cheap ammo
Let me know how the rocksolid mount fits/works. I just got some brown bear 203 grain boat tails for the M39. I was shooting 3-4 MOA with Russian copper washed surplus. I think this rifle is going to end up with me loading 54r just because. Why not, already doing 9/40/45/.38 and 30.06