I built a couple of fake snipers back when Century was selling scopes and mounts for $30. Wish I had bought a coiuple of dozen of them. The 91/30 I still have will shoot a solid, consistent 1 1/4 MOA, not bad a for a 3x scope.
J&G's snipers are the same as mine, modern builds, They are not originals. I like mine lot, but woiuld have a hard time coughing up $450 for it.
IMO, the K98 and MN are about equal in capability, just differnt, that's all.
If the scope mounts are "new-production", the rifles are either standard M-Ns that have been "sniperized" to increase the profit margin, or at best they are ex-snipers. Either way, the scope &mount will not be original equipment. If they are anything like the "sniper" RPK mount&scope combos I have seen, it's not worth $100, much less $350.
Note that it also says the scopes are "of recent production", meaning they are also not original.