We all know about the 57mm AA gun development mounted on the bmp-3 but is there plans to mount the 57mm gun on bmp-3 in role of AFV? I've seen articles on BTR-80 version with 57mm gun.
I would suspect so.
Even older forces using BMP and BTR and MBTs will get new weapons no doubt... the new vehicles get 57mm guns for the IFV platforms because the 30mm guns are not good enough to engage enemy IFVs... well that logic would apply of an old unit with BMPs came face to face with enemy IFVs so they would need 57mm guns too.
Of course the priority would be for new vehicles I would suspect, but eventually the old vehicles could get new turrets added to make them more compatible... but the obvious problem is that the old vehicles had a commander and a gunner in the turret while the new turrets will be unmanned.
In theory as long as a gun can elevate high enough it could engage aircraft
MSTA can elevate its gun, but would not be much use against aircraft....
The btr-82 30mm gun is a dedicated ground attack turret but in theory could engage a helicopter.
Actually I have heard the BTR-82 will have the new air burst ammo system installed so it could take out UAVs too...
And it would also be useful against targets behind front cover but with no top cover (ie behind a brick wall).
The bmp-3 was chosen not because it's was cheaper and had a multitude of weapons including atgw capabilities but because it coped better in the desert climate. so its no surprise that iraq chose it having similar climate. Kuwait also have it and Saudi rumoured to be interested although it's gone quiet on it.
Also it does not get credit in the west but in flat open terrain like in the desert having a 100mm gun able to fire HE rounds out to 7km range is a rather potent and powerful weapon against a variety of targets 30mm cannon fire would not have much effect upon.
Wasn't the idea behind the 57mm AA capability to have some sort of radar vehicle feeding data to the AFVs?
Don't remember exactly.
Fitting a dedicated radar on each AFV could get expensive.
In most air defence units all the vehicles link together and share target data, normally with one vehicle managing the engagements so they don't all open up on the same target and ignore the other threats. Targets are given to vehicles so all targets are engaged... equally if it is 6 Tunguskas then they don't all need to operate their radar in scan mode to find targets.
So a gun vehicle with a 57mm gun would not need its own radar as long as it operated somewhere where the air was being scanned by something for targets it would be fine.
All new vehicles are fitted with datalink systems. In case of need air defence vehicles or radar systems organic to the unit will transmit data to AICV´s to guide their weapons in air defence mode.
This bottom photo has the standard IFV turret that looks the same as the 30mm cannon armed turret shown on the Armata and Kurganets IFVs, but with a 57mm gun... though it looks a rather small calibre to me...