If talks about number, let say 5000 is consider rare for particular organic weapon. If it's under 100 pcs and for trial use, there's hi chance of that weapon never go to public for examination.Actually there was this old photo of us army personnel carrying ss2 in US. They purchased some test purpose only.
Me myself can't figure what have changed on SS2, but i highly confidence they keep longstroke gas piston along with AR 18 like bolt. Other than the fact that they removed 3 round burst that rendered unpractical.
I'm kinda surprize when they make krinkov variant of SS2 (V5) and got good attention while reliable on field. IMHO if they want this rifle got a face for export customers, they shoud facelift it with kind of Czech do on their Bren 2.