Unknown machine gun links, 5.45?

I recently received a set of small machine gun links, I was told they were experimental links for 5.45x39mm but they are unlike any that I’ve seen. A 5.45 round fits right but seems a little too short?
Could this be for 6x49mm? Or something completely different?


Hi Jack, good find! Yes, it is one of several models tested with the 5.45x39 cartridge. There is a 6x49 model that is very similar but has a small bulge in the shoulder end.



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Thanks Fede! any idea what firearm it was for?

PU machine gun experimental models from the 70’s.

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