.60 caliber machine gun round

[jonnyc]

How/Why would the smaller .60 be illegal and the larger 20mm not?

Information

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[Garandrew]

Its just what I was told on another web sight, when I went to sell it..

[phillydude]

I was asked by an gentleman to help sell one of these rounds for him. It's mint any shiny and live ! Marked FA 48 on the bottom. If anyone is interested send me a message and I can pass along his info