QR-SAM is supposed to replace OSA AK units in Army. Now apart from foreign new import options like Spyder/Tor etc, Russians did offer to upgrade the legacy OSA AK systems to latest standards.
1. The newest OSA AKM missiles can travel much higher, more than 10+km in altitude. DRDO needs to do better than that.
2. And secondly high altitude deployment will also be done along the LAC.
Considering these two points the real altitude will surely be atleast 8-10km depending upon the target. I am not denying that.
I am just saying that the official word is 6km throughout. And any BEL employee is unlikely to say anything else. Therefore I suspect that Jane's may have had made a mistake.
But then Jane's has a very decent history, much higer than likes of SIPRI even. Let's see.
Wait for an official word. Or atleast 1 more source which doesn't derive Jane's as a source.