Its popular among those who planned to SBR it from the start.
But a majority of gun owners have nothing to do with NFA stuff and this thing has basically zero point as a pistol.
nailed it right there. most people dont want to mess with hassle of ATF paperwork and $200 stamps. I would not have considered purchasing the scorpion for a second, irregardless of how nice it is, without the ability to SBR it.
when I have shown my EVO to people, they think its cool, but I get the "eh, but what are you going to do with it?" response as a pistol. as an sbr, they say "bleep thats sweet!" but still balk at the ATF / stamp / $200 / several months wait thing.
the only people who see a value to the scorpion are the NFA crazies (like me) or someone who will be content with a sig brace or a cheek weld device.