When Argentina invaded the small South Atlantic island of South Georgia as part of the larger Falklands Campaign the small detachment of Royal Marines used a small portable weapon to damage the Corvette ARA Guerrico that was there to provide Naval Gun Fire Support. The weapon was a Carl Gustaf Recoilless Rifle.
We have at least some indication that the Israelis are equipping their Super Dvora MkIII patrol boats with these, or at least something similar.
The US Marine Corps apparently thinks very highly of this weapon because they plan to equip every squad with one. The US Army is only slightly less enthusiastic. The intend to equip every platoon with one.
Essentially it is a man portable shoulder fired artillery piece. The range is relatively short but there have been numerous improvements with more to come. There is already a new confined space round that minimizes the effect of backblast that has been a disadvantage of recoilless rifles.
A new guided round, expected to be demonstrated in 2020, should increase effective range to 2000 meters.