i don't see any aspect of it being an NFA item. I'm an avid NFA 'stamp collector' and pistols have no barrel length limit, mag capacity, etc. the only thing that would qualify it as NFA would be if it is fully auto which is doubtful, especially in .22
an actual Mac will cost beginning at $6000 on up in this part of the world, plus your tax stamp, and the dreaded wait.
also, just because it 'may' have a real can on it...looks like a shroud to me, does not put it in a 'class on it's own'. you can only do what you pay for, you pay for the form 4 stamp for a can, that's it. if it's a rifle and you have a legal can it's more paperwork and another tax to SBR it.
a forward grip on a pistol is a no no in pistol form. if it started life as a carbine, rifle considered, was legally SBR'd, then the forward grip would be good.
keep it like that, add a shoulder stock, will get you an additional 10 years for another illegal part on a pistol.
jus sayin!