Edi
your right all soilders what lighter stronger better kit, and when they get issued light stronger better kit than the previous version a weeks later they are asking for a light stronger better version again.
The fact is simple the load a solider carries has not significantly changed since WW1 it’s just made up of more and different stuff.
A sniper or sharpshooters rifle needs to be ultra robust to support the solider after a IFV is blown up, he falls down a mountainside off a helicopter or just plan drops it again. The AI does this in spades.
The SF requirements are often different to green army and have different constraints to purchase against eg statements of requirement etc, god I suspect the army has more AIs than SF soldiers.
As for a stalking rifle use what makes you smile.