The Sporter Had An AKM Receiver Which Takes Fixed Butt Stocks But The Client Wanted A Folding Stock.  AKM Rear Trunnions Have To Be Changed To An AKS Or Folding Trunnion Which Is Possible But Costly.  So To Keep Cost Down A Polish Side Folding Stock Was Installed Which Can Be Used With An AKM Rear Trunnion.
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