Ok so ive been looking at scoping my mosin nagant 91/30. It looks like the easier option is to buy one of the 6.5" rails that mount by removing the rear iron sight and installing this rail in its place. I would prefer this over dealing with a gunsmith to install the p/u style scope mount. However, I hear tell of these rail mounts not staying firm under the stress of the rigorous amount of recoil produced by these rifles.... so.. good investment or not???