.50 BMG (12x99mm) by NAMMO/MAC LLC, Partial Polymer Case & Polymer (Plastic) Belt Links, Photo

Photo from European Security & Defence, February 14, 2020

“Nammo and US company MAC LLC are together offering .50 cal ammunition with lightweight polymer cases. (Photo: MAC LLC)”

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My understanding this polymer ammunition was being issued to the US Marines. Ought to be able to kick some ass with the Raufoss & APIT.