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The Wz.35 was in early production actually slotted in the rear of the grip to accept a detachable stock, probably Mauser style, to double as a holster, however this likely didn't see much production or use. The Polish Army didn't use stocks, the Germans didn't use them with stocks (and I believe they stopped having the slots cut to save money and resources), possibly the hope was that the Argentinians or other interested parties would perhaps want to buy some, but that never happened.
Reproductions have been made, though there aren't many of them. The stock pictured in this collage appeared in a listing some years ago, claimed to be an original FB Radom stock, which doesn't seem likely. This stock is in ridiculously good condition, like it was made recently, which would suggest that it's *probably* not that old.
At any rate, even if this is a replica, it's a pretty good one.
I do not believe the Wz.35 is exempt from SBR status in the US with one of these stocks, like the Mauser C96 pistol famously is, so one who's interested in one of these would probably want to file some NFA paperwork for that.