If you're looking for a long rifle, the Finn M39 is the best bet for a M-N. They are still quite common and inexpensive. If you decide to install a scope however, be aware that almost all M39's were built on hex receivers, while current scope mounts are made for M-N round receivers. If you desire a carbine, I would try either a polish or russian M44, or a M91/59. The only difference between them is the M44 has a attached bayonet which would have to be removed by grinding the lug off the end of the barrel. Or you could keep the thing on, but the M44's were made to be shot with the bayonet extended, so that could be a problem. M44's have round receivers, but I'm not sure about the M91/59. Also be aware that the Finn's built their rifles from captured russian guns, so the only metal parts matching on a Finn would be the receiver and bolt, and that would be force-matched. The Finn's used their own barrels and stocks, and that is what makes them more accurate then the russian M-N.