What the source confirms
The official experience thumbnail visibly names Revolver and labels it Rare. That makes the identity and rarity safe to publish.
Role hypothesis to test
A visible ranged option for testing safer lanes and priority targeting.
What remains unknown
Exact damage, fire rate, and Key cost are not published in our source set.
Run a controlled comparison: keep the rest of your loadout stable, change this slot, and record what ends the run. That result is more useful than a copied tier label with no patch or source.