Quote:
Those gun types affected often have either a fairly weak AP round (not much use at medium and long ranges UNLIKE the HEAT round) or are only equipped with HEAT
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That is alas untrue. Many coutries are still using and designing advanced light guns.
Look at the modernized Scorpion-90, AMX-13/90, V-150 with gun, or more modern things like SIBMAS-90, ERC-90, Piranha-90...
You have lots of quite modern AFVs with good small-caliber AT guns. Even 76 or 60mm rounds will have a laughable HEAT pen, but quite good APFSDS rounds.
I guess slat armour can be represented by a slightly downsized HEAT uparmouring, say between 20 and 30, to minimize the virtual armour bulk encountered at high angles (however, do as you want, you will still have armour ratings >1000 at very high angles).
With such a value most old or new light-caliber tank rounds can be counted as ripping throught the armour without damage, as Backis pointed out. And I fear such weapons could really be encountered by SLAT-armoured vehicles, even in the near future, since the thing seems to become a standard of the allied kit. Even though might tanks would be surprising, even insurgents could dig out medium AT guns or RCLs.