A while back (~ a year ago?) a Chinese (mainland) company had a M56 SKS out, spring powered... but as I recall it used shells (like the Marushins etc). Don't think it was ever very popular, nor have I actually ever seen one for sale anywhere.
Sorry don't remember the name of the company... I'm thinking "Shibuya" but I know it wasn't that. "Simbad"? Something like that.
Actually just tried Google to find the name -- no luck. But did find several places selling it. ~$35 USD. Look up "airsoft M56 SKS"
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