seems to be a tough call. We can be sure that the tavor wont be looked upon favourably in terms of being a standard issue. Its great for SF., but somehow i'd expect them to go for a conventional non-bullpup rifle.
i for one, have my misgivings about the multi calibre concept. I mean sure, it'll make it easier to train everyone on one platform, but knowing our government, they wont order enough conversion kits, let alone, other optics, and add-ons. I mean we're giving out 20 round mags as standard on the insas when we DO have a 30 round mag which perfectly fits the assault rifle, to save on cost, and bullets.
The day your basic indian infantryman, starts using optics , laser designators, and UBGLs, will be the day i start believeing in god. It seems unlikely that the govt will sanction enough funds to make this as good as it sounds. No one really cares about the grunt.
ALso, i dont see any matured multi-cal rifles that could be inducted without any scope for problems.
A lot also depends on what specific calibres they want. If its just a 7.62x39 and a 5.56 nato? or do they want a capability to fire the 7.62x51 nato for long range purposes?
the SCAR is definitely the most obvious choice in the latter scenario. However if the army is hell bent on the 7.62 (Not enough of a class difference in cartridge in my opinion), they'd probably be looking at the following three:
1] the cz-805 - 7.62, and 5.56 (also 6.8 remmington supported). Decent assault rifle. Probably costs a tad bit lesser than a scar. Allows a 14 inch barrel for longer ranges. 20,30 and 100 round mags., Picatinny for attachments.
File:Cz805.png - Wikipedia, the free encyclopedia
2] The beretta arx-160- 5.56 nato, 7.62 and 5.45 russian. Slightly thicker profile that some would like. But decent accuracy.
File:Beretta AR with ACOG.jpg - Wikipedia, the free encyclopedia