Pakistan is already in the process of acquiring 300 VT-4 tanks, its a 52 ton tank equipped with the GL5 APS.
It will be interesting to see whether the Army still keeps languishing over the piecemeal orders of Arjun Mk1A or inducts 300-500 of them to counter Porkis
Actually the Mk1 APFSDS developed for Arjun is longer than the M829A3 APFSDS round found on the M1 Abrams.
Mk1 APFSDS measures 944mm in length.
My guess is that DRDO would have just increased the length of the projectile keeping the length of the projectile+cartridge same at 944mm for the 120mm...
Front turret gap(which is not a weak point at all as some might say) is most likely to be resolved in Arjun Mk2 version.
55ton, 3 man crew, smoothbore gun, unmanned turret all these things point to one specific tank i.e. T-14 Armata.
That's what I meant to say.
Hull armour is perfect fine, it is gunner sight which might be a weak link.
Redesigning that will solve all the problems.
And also a powerful new APFSDS is needed.