It does not have the stepped down rails, the holes are drilled for the trunnion and there are selector marks on the side of the receiver. They are just an economy receiver. I have used several and have no problems with them. You have to do a little fitting here and there but it is not a big deal. They are perfect for Rommie fixed stock builds.
They build and sell them in large quanities. And, they dont have some features the "premium" receivers in the line up do. The website tells exactly what. They are a good value, and there are many AKs using this receiver.
Has anyone noticed that the factory holes in the rear seem to set the trunnion a little high thus causing a gap between the selector and top cover??
This was brought to my attention recently and looking at my other builds on the nds 3's they all seem to have a little gap there and this is not an accurence on my rifles using there other recievers.
I just built two this morning on two of the nicest non-G kits from Apexgunparts. Went together like a dream, everything lined up perfectly. NDS-3 receivers? Just be glad they're available. They are a great value.