You may very well be on to something, as it does look beyond the talents of your average basement smithy. I hadn't considered that. Must've been the shock of seeing that thing.I would rather attribute this to the Darra/Pakistan shops. I have seen an AK47 receiver set up as a bolt action pistol grip box magazine .270 WCF with folding stock in the Pattern Room Collection that came from Darra. A close up markings would possibly resolve the question.