The guy in the above video is actually shooting one on a visit to the Czech Republic. He has at least one other video of his SBR Vz. 61 he has in the US. As posted above, so far as I know, there are no transferrable Vz. 61s in the US. Its a shame, I'd love to have one. I got the form 1 back on my Vz. 61 recently, now looking for a gun smith to install the adaptor plate and stock.
My one and only MG is a M10/45, which is huge fun, but doesn't have as much character as a real Vz. 61.