The UGR was added to Warzone shortly after the launch of Season 3 Pacific in 2022.
This is a Cold War SMG with a competitive Time to Kill (TTK), but with a few downsides that make it tough to use in a practical sense.
Although the UGR hits hard, it’s held back by its small magazine size of 30 (though you can extend it to 36 with a specific magazine attachment).