[The KG9 Kid]

"... I’m no expert but I thought some of the commandos [...] were using what looked like FNC assault rifles with perspex see-through magazines."

Those were SIG-551s in the hands of the Indian NSG forces. I was looking for a picture of an NSG commando with one, but couldn't find one quickly.

[Ronaldus Magnus]

Those were SIG-551s in the hands of the Indian NSG forces.

The rifle in question is the Indian produced INSAS.