Many 94's were converted to SBR's or (with the addition of a registered trigger pack) into MP-5 configuration. They are high $ because of the scarity.
93's are more common but have a couple of limitations. AFAIK, they have 1-12 twist barrels so 55gr bullets are about as heavy as you can go. Magazines are very scarce and VERY expensive (more so than MP-5/94 mags).
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"Robo is right" Fuzzball