[quote=@Aristo]
Large direct-fire pieces might come in the form of 60mm AT recoil-less rifles and bazookas; good for laying siege to sturdy positions and packing a wallop at close range.  
[/quote]

iirc, the current standard for light anti-armor is sitting at about 84mm (AT-4) and 120mm (larger RPG-7s and typical ATGMs).
-Russia currently fields the 152mm Kornet ATGM.