You can unlock CoD: Black Ops Cold War, Warzone's ZRG 20mm sniper

Call of Duty: Black Ops Cold War and Warzone’s new weapon, the ZRG 20mm sniper rifle has been released. Here’s how to unlock it by completing its Longshot challenge

Zrg 20mm - additional damage that increase with the size of the target the description is for vehicule wich doesn't make sense in zombie.. does it apply to bigger zombie/ boss ?

How to unlock the ZRG 20mm sniper rifle in Call of Duty: Black Ops Cold War - Dot Esports

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You can unlock CoD: Black Ops Cold War, Warzone's ZRG 20mm sniper rifle - Polygon

The best ZRG 20mm loadout in Call of Duty: Warzone

ZRG 20mm, Call of Duty Wiki

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Unlocking the ZRG 20mm Sniper (Black Ops Cold War)