Would it be possible to make an AR upper for that caliber? It's a round that lends itself well to the carbine/SMG concepts, but right now the only one I know of is the PPSh clone made by IO, and it's cost prohibitive. I don't currently have an AR but I would definitely get a 7.62x25 upper if they were available.
I get about 1600fps out of a CZ-52. With a little longer barrel I bet it would really scream.
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