If this rifle is heavy,perhaps it would be used by 6SIR for
defensive purposes, eg. Installation Protection so that they can
take down vehicular bombs etc. So far, the local snipers i've
spoken to say that SAF Snipers for field/jungle warfare carry the
lighter ones while Installation Protection snipers carry the
heavier stuff, for more stability.
Imagine lugging 6-8kgs of weapon alone,compared with like
3-4kg.