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FWIK there is a pistol version that means if anyone did bring it in, the mags would have to be pinned to ten rounds.
Just that makes it a deal breaker for me!
My guess is that it will be prohibited just like most of the other GSG .22 versions of prohib firearms, like the HK MP-5 , the AK-47 or the StG-44.
Also since it looks like this, with a really long barrel hidden in a fake suppressor, who would want one?: