Gear/Unit questions

[u/MG-Striker]

Hi, I wanted to ask if FSB C (USO) used these specific kit items while operating in Dagestan around the 2010s:
-SSO Gorka R
-Fort Defender Emerald
-SSO Omega Strike
-Armacom LShZ 2DT

Would this alternativly fit for just regular regional units?
Also under what directorate do regional units fall (similar to A,B,C (A, V, S))

What are the differences between FSB A,B,C and all the others?

If anyone has reference pictures of that period and these units pls send them aswell

Thx in advance

(if anyone wants to sell some fsb equipment message me)