This goes for all tanks, but the vents are not the only weak spot on them, the flat vertical plate on the back of the base of the tank is only medium armor, dump an entire amr mag in there or shoot it a few times with the quasar cannon and that bastion of savagery will go up in flames
OP, according to the wiki you can just shoot the top of it with Recoilless or any anti tank gun, and lacking that the rear of the body is medium armor.
Quoted from wiki:
Unlike other Tank turrets, the Barrager's MRL lacks a vent weak spot. However, the MRL itself is a large target susceptible to anti-tank weaponry such as the GR-8 Recoilless Rifle or G-123 Thermite.
If a Helldiver lacks anti-tank weaponry, the rear of the Barrager's hull can be damaged by medium armor-piercing weaponry like the AC-8 Autocannon.
That was (kind of correct) a few patches ago: there ARE vents behind it, on the chassis - when it first appeared shooting it would be almost completely useless, but now those weakspots destroy them just like the other tanks.
they can but they’re kinda hard to use for that since they get stuck on whatever they hit first, so it’s hard to get it to go down the hole fare enough to close it
The back of the tank's main body has some vents that are weak points autocannon can destroy. Although sometimes when you do that the turret survives the death of the main body and still keeps shooting. As far as I know the barrager turret itself has no weak points, so it takes anti-tank damage to kill it. They should fix both of those things IMO (the turret surviving the body's death and having no weak points).
The weak point should be the on the back side of the turret. If I remember right you also can shoot the tracks or the back of the lower part from aside but it's far less effective.