Popular shooters and ammo glitches often go hand in hand, even when the developers of the game are particularly quick to jump onto these errors due to the obvious and severe impact they have on balance. Call of Duty: Warzone hasn't really had a big one - until now.
The glitch is deceptively easy to replicate, indicating that it mostly likely got into the game via the most recent update - otherwise it would have been discovered earlier. Also, since many players are bound to accidentally trigger it, we don't think its likely to incur punishment.
The way it works is that when you have a weapon with an underbarrel attachment equipped (one that shoots something, such as a grenade or the 12-gauge attachment) and find a weapon laying on the ground, if you empty your underbarrel weapon, swap the guns, then swap back, you'll have ammo for the underbarrel, even without any in reserve.
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It's that simple - swap out the gun and swap back. This is why we said players have likely ended up using this glitch accidentally since its introduction. It's also likely to get patched quickly, since we don't imagine the underlying cause would be too difficult to spot, and something that gives players such an obvious advantage is guaranteed to get the developer's attention.
Activision and Infinity Ward have only recently won a tough, uphill battle against cheaters in Warzone. For this rather game-breaking glitch to pop up right in the aftermath is all kinds of bad luck. That said, it isn't quite on the same level as aimbots, plus it's something in the game code itself.
For non-glitchy attachment loadouts, check out our guide.