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the single stack bolt wil not work what so ever. It will only pick up the rounds from one side of a doubble stack mag. There are many versions of npap rifles that were imported. It seems as they got more popular it was easier for them to just use there mill spec parts than have proprietary parts made.
All NPAPs have double stack bolts.. The original PAPs (notice no "N" in the part name/number) had the singe stack bolts. Most of the issues with the single stack bolts are due to magazine latch height issues. This has been gone over dozens of times over at AKFiles..
Confusion has grown because people will call a PAP a Gen 1 NPAP and regular NPAPs Gen 2.. There is no Gen 1 or Gen 2.. It is a PAP or an NPAP.