Dude, sorry but you are completely misinformed about some basic facts on small arms procurement.
Essentially it is an AR-10 (7.62x51mm NATO) rifle which is perfect for Indian Army in mountain warfare. Pakis use G3 (7.62X51mm NATO) which has greater stopping power and overall greater range than AKM (7.62X39mm) and INSAS/TAVOR/M4A1 (5.56x45mm NATO) and consequently outgun us at LOC.
Keep in mind Pakis and Chinks will use LVL III and LVL IV Armor Plates in any conflict in the next 5-6 years just like us. As LOC and LAC has shown, engagement distances will be 400m+ with the SIG 716I being overkill, having pretty decent controllable automatic fire (much better than G3, FN FAL) in CQB.
The US Military in the future will use the (6.8x43mm NATO (?)) because of the above reason. The interesting thing is that the 6.8x43mm has better ballistics than 7.62x51mm at ranges beyond 700m and is much lighter, almost by 40%, with just 20% less Kinetic Energy than 7.62x51mm.
Now here is where things get very interesting.
https://www.quora.com/Can-I-fire-a-...bolt-action-rifle-without-changing-the-barrel
For now 6.8x43mm is not in production anywhere so 7.62x51mm can easily do the job until the late 2020s to 2030-31-ish.
Thus as long as you have different bore barrels for the Sig 716I, you have a readymade multicaliber gun. Looks like GPL treatment by then COAS (now CDS) forced the Indian Army to make the right choice!
I will post on the CQB Carbine RFI later.