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I've thought about those M90 NPs. I wonder why they build a 5.56 with the thick receiver and bulged trunnion but they wont on the NPAPs. And I'm on the fence about those adaptors to take AR mags. I'm sure they probably run fine just looks odd. I'm guessing Century puts those on after importing them do you know. If you've shot it yet what's your opinion.
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The M90 and M85 are built on the same receiver, whereas the NPAP is built on the M92 receiver and trunnion. The latter, of course, has the thinner receiver and narrower trunnion.
As for OPAPs, Century took them out of their catalogs beginning with 2015, so I don't expect to see them back. I don't think they sold that well once the current iteration of NPAP was introduced. A lot of people complained about the weight and the surplus furniture. Plus, internet culture being what it is, a lot of people thought they were just demil'd M70s built on new receivers as a cheap way to pump out rifles.
All the obviously factory-new parts in the world wouldn't kill that rumor. Proof that you just can't please anybody these days.
I have a BNIB OPAP sitting in my safe right now that I bought a couple of years ago for a project I still haven't gotten around to completing. I was going to convert it into an all-Yugo/Serbian M70B1 clone, but I've lost momentum and often considered selling it when the market is right. Not sure what I'm going to do with it.