[amer_ua]

I am not a road or gravel rider, but - is it fake RIVAL\APEX groupset (link to AliExpress)?

i`ve got SRAM NX 11 speed rear derailler and it is piece of crap to be honest. big play out ofbox, my old xtr rear derailler with over 5 years of usage (it had WAY more play) worked better

is there any chance that fake (if they are) SRAM components will work better?

 

[RS VR6]

It might not be fake...but its gray market parts. The serial numbers will probably be filed off and you won't be able to warranty it.