The fact is, Horilka, that there were 40-50 intervening years before any of the Soviet guns made it to the civilian markets in the US and Canada. Unless these crates came with a detailed, fifty year service log, there is no way to claim with 100% certainty that any given rifle is all original, non-refurbed, or as-issued.
However, there are various attributes by which, through meticulous, OBJECTIVE, examination we are able to say that particular rifle is
possibly all-original, or
obviously lightly re-worked or heavily re-furbished.
When a gorgeous rifle like this pops up, it's easy to overlook or forget these obvious, yardstick attributes that we take into account when we examine lesser, and aesthetically inferior carbines. As each of these attributes arise during examination, by varying degrees we have to remove a given carbine from consideration as a prototypical example of original condition.
This rifle falls into that category. By virtue of these various refurb attributes i have pointed out, this rifle cannot be called an example of original condition. As a result, there is no way to say if the stock is original.
1958 K in an as-issued hardwood stock?
Meh. Maybe. But, given that this would be an exception to the rule (observed standard, really) the bar for proof must be placed very high. As each indication of refurbishment appears, the originality of the piece falls further into doubt, and gets incrementally harder to argue.
I've pointed out four questionable attributes for the OP rifle already. And I am still hopeful and waiting for more evidentiary photos (annealing stripe, muzzle crown, bayonet staking marks), though it seems these will be purposely withheld.
I get it, it's not my ball. If pcvando doesn't want to play anymore, he can take the ball home and end the game.
Lest we forget:
Boris, come out and play!
I came out to play, pcvando. Why did you go home already, sulking?