First off, the scopes on most current repro snipers are newer reproductions. The quality is great, as most are built exactly like the originals or even at the same factory. But, I can understand if the 3.5x is not to your liking. However, if you're not shooting beyond 300 yards, it should not be a problem, at all. It is a 26mm scope, but you can get the mounts with 1 inch rings, too.
Also, the rifles being sold by RGuns are NOT reproductions. They are the real deal, hence the price. I have a '44 Tula PU from RGuns that is simply amazing. I own a total of seven Mosin snipers. All of them are real or "ex-snipers". I have a '43 Tula PU that I have shot accurately out to 700 yards with Bulgarian copper washed light ball. The scope is an original Progress factory PU and, while not quite as clear as the one on my '44, it's still very serviceable.
If you don't care about the collector value, get a repro. If you want the real deal, look for a restored ex-sniper (or restore one yourself), or get an RGuns complete original. In any case, buy the bore and this especially holds true for the repros, as they were thrown together at random and not hand picked to be snipers, based on their accuracy, like the originals.
Best of luck!