What are the differences between a standard Norinco Mak 90 and a MAK 90 with no manufacturers mark that I can find, It has Mak 90 sporter on the side with an open top front sight hood and several ribs stamped into the receiver cover? It also says Armco ak47 made in China on one side and IAC Billarica Ma on the other. Any help identifying any differences,plant of origin etc. appreciated.
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