Everyone who keeps saying shoot the vents, read the post again please. OP specified the Barrager tank, which has no vents.
https://helldivers.wiki.gg/wiki/Barrager_Tank
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.
Never mind that boys Mastia needs our help, stat!