Not sure if I have seen anyone post this up yet, but I had a Noveske lopro sling swivel stud for a Troy handguard sitting around that I thought I would see if it fit my new NSR upper. . . it did.
The threaded backplate has a raised section that sits in the Troy Alpha/TRX holes. For the NSR, I just flipped it over so the flat side is resting against the flat side of the inside of the NSR. The washer that rests in the outside of the Troy rails fits nicely in the larger part of the keymod slots.
It just happened to time perfectly. I am not thinking I will keep this here, but it is convenient for zeroing and may be worthwhile for someone else.
Here are a couple simple pictures.
You can just see the raised portion through the hole in the NSR. That is the raised part that would sit in the Troy holes.
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Patiently awaiting my .308 NSR rail.









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