No 'sources'
but an educated guess.
It makes no sense to have 3 different calibres in one squad (5.56x45 mm, 7.62x51 mm and 7.62x39 mm) in addition to 9x19 mm.
7.62x39 mm = .300 Blackout, perfect for CQB and upto 300 m.
The arrangement I made was based on the least amount of effort Indian Army would need to make to have a modern fighting unit.
I've yet to see any UGBL for an MLOK based free floating rifle which can be appropriated cheaply. Makes the most sense to give 1 x AK 203 UGBL to every maneuver element.
We have also seen Sig 716i DMR configuration in certain cases.
You don't need an assistant LMG Gunner when using the IMI Negev NG7. That is essentially a rifle.
RCL carrier can be made to carry a rifle.
The ammunition carrier can be made to carry a Sig 716i to act as a spotter for the Fire Support Element.
This as it is would need no extra equipment or guns. Perfect for the lazy SOBs behind the INSAS disaster.
So to re-phrase :
Squad Leader
1 x (AK 203) (7.62x39 mm)
1 x (Browning Hi Power) (9x19 mm)
Maneuver Element 1 :
Rifleman
1 x AK 203 (7.62x39 mm) (UGBL)
Rifleman
2 x Sig 716i (7.62x51 mm)
Maneuver Element 2 :
Rifleman
1 x AK 203 (7.62x39 mm) (UGBL)
Rifleman
2 x Sig 716i (7.62x51 mm) (1 DMR Config)
1 x Browning Hi Power (9x19 mm) (2IC)
Fire Support :
LMG Gunner
1 x Negev NG7 LMG/SAW (7.62x51 mm)
Rifleman / Missileer
1 x Carl Gustav RCL (84 mm)
1 x AK 203 (7.62x39 mm)
Rifleman/ Ammunition Carrier
1 x Sig 716i (7.62x51 mm)