I am looking for one for my 575xxxx sn. Carbine. I found one but the top picture is not clear. I asked the seller for a better picture. In the current picture the magazine wall looks smooth rather than having two groves in it. It does have the oil hole on left side. If it is smooth would that make it a rework with the hole drilled in it? I Craig riesch book he states that the oil hole has been added during updating? But from all I have seen the type 5 should have the two groves

Thanks for any help.
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