Hoho, very nice! I knew I recognized that LIRD from somewhere - I thought it was just a coincidence, they were pretty fashionable back in the 90s.
I must correct you, however. Fotona EFCS series was not what was used on JNA M-84 tanks or Vihor. Those FCSs were made by Rudi Čajavec Banja Luka (different company).
EFCS contract was awarded to Fotona to make an upgrade for T-72M in Yugoslav use (72 pieces) to bring them up to modern levels, for cheap(er than the FCS SUV M-84A). It was later considered as a competitor in Igman project, targeting largely export market. It had a lot of success abroad, particularly when the (newly independent) Slovenian and Croatian militaries later decided to re-FCS their tanks (due to the lack of logistical support and parts from Rudi Čajavec company, now located in R. Srpska). Also, Croats completed their Vihor with Fotona parts and M-84A spares, so the way it exists IRL, it is a Frankenstein tank of sorts. Only later did it crystalize itself into "proper" Degman (not the 1995 version). When it comes to proper Vihor program (as intended for JNA), Fotona had a few subcontracts - integration of thermals, LIRD and muzzle reference system. All systems were later used in the Slovenian army, but on M-55S and M-84S tanks. But I digress.
The most interesting part in your links is this, describing the model we currently have in game:
This is a further development of the above with the following additional modifications, new fire-control system with a ballistic computer, new intercom and radio set, modernised 125 mm smoothbore gun 2A46M2 and removal of two 20 mm cannon and installation of 30 mm 2A42' cannon on right side of turret only. The primary role of the latter is to engage low-flying aircraft and helicopters.
The tank commander has a stabilised SFIM MVS 580 day/thermal panoramic sight incorporating a laser range-finder while the gunner has a FontanaTIGS day/ thermal night sight with integrated electronic module with ballistic computer, control panel and CRT display. The gunner retains the standard TPD-K1 stabilised day sight which incorporates a laser rangefinder.
One prototype of this version has been completed and tested.
While I read this particular bit of text many times before, it only now clicked for me. It's not "FontanaTIGS". It is Fotona TIGS
, a system I know a fair share about. It is a thermal imager module developed for Vihor which now goes as a part an upgrade of EFCS-3-84 - which confirms that it is actually the Fotona's FCS, with thermals involved. Exciting! Here's a few photos of testing of the subsystems for what was to become "M-84S" (but didn't). Note the muzzle reference system. From what I know, the huge lot of these thermals was intended to be for Vihor.
Also, note that the reason why this M-84 variant uses thermal, 2nd gen night and day sights at the same time is due to the specific shape of the turret, which was casted with one sights hole - and not two, like all other tanks in T-72 family. If applied to T-72s, they would only have one "bulge", with the TIGS (see the turret model of the Vihor ingame), while day/night sight module goes instead of the TPD-K1 module.
So, what we know about the base system (without thermals or muzzle reference) can be summarized as such:
Do you happen to have any data on the gun stabilization on Moderna? Fotona did offer such upgrade to my knowledge (GEB-84), but even on Slovenian tanks, the K1 gyroblock was retained from the original Rudi Čajavec SUV M-84(A). Also, how was the 2A42 stabilized? I notice it isn't mechanically linked to the gun, so it probably has its own stabilization.
Moderna could get really f*cking accurate with this.