A lot of people seem to think the adoption of 3 different calibres of assault rifles is going to create a huge new logistical problem, the reality (purely in terms of depot-level logistics lines) is a bit more nuanced. There isn't so much of a 'new' logistical problem as there is an 'ongoing' one -
Calibres in use:
9x19 -- Hi-power, Sterling, MP9
5.56x45 -- INSAS, INSAS LMG
7.62x39 -- Various AKs
7.62x51 -- MAG MMG, Bren
7.62x54 -- SVD
Five distinct small arms calibres that pretty much every IA depot has to stock in order to keep all sections of infantry resupplied (riflemen, LMG gunners, platoon-level MMG gunners, 'Snipers' etc.). Of course I'm not counting the more specialized calibres like .50BMG or Russian 12.7x108 as their intended use is mostly in either emplaced systems or anti-material use cases.
And this is what the picture will look like in future (if everything goes how we intend it to):
9x19 -- Hi-power/future pistol, MP9
5.56x45 -- Carbine
7.62x39 -- AK203
7.62x51 -- SIG716, Negev/future LMG, MAG MMG
8.6x70 -- Scorpio/future sniper (.338lapmag)
As one can see - even though the ratios have changed, the number of distinct types of ammo to be stocked will remain the same, not much a 'new' problem with regard to resupply-related logistics. HOWEVER - what this represents is that in the process of modernizing the infantry, we had an OPPORTUNITY to streamline this and perhaps eliminate 2 of the rifle calibres by adopting a single high-intermediary cartridge (6.5 or 6.8), but we haven't taken that road.
@rkhanna @Killbot @Johny_Baba @abingdonboy @COLDHEARTED AVIATOR