Prototype B evolution recipe

Answer: Max Short Gun, collect Weapon Power-Up, and evolve it into Prototype B

Keep Bracer in your inventory. It does not need to be maxed. Open an eligible chest after all requirements are ready.

Steps

1. Obtain Short Gun and raise it to maximum level.
2. Collect Weapon Power-Up during the run.
3. Keep Bracer in your inventory. It does not need to be maxed.
4. Open an eligible chest after the requirements are complete.

If it does not evolve

• Confirm that Short Gun is at maximum level.
• Confirm that Weapon Power-Up was collected in the current run.
• Confirm that Bracer is in your inventory.
• Open the chest only after the requirements are complete.

Weapon Power-Up is consumed by an evolution. To evolve another Operation Guns weapon in the same run, obtain another Weapon Power-Up from a level-up choice or stage pickup.

Next guides

• All 11 Operation Guns evolutions
• Operation Guns progression guide

Sources

• Vampire Survivors Wiki: Evolution
• GAMEX: Operation Guns guide
• Pro Game Guides: Operation Guns weapon evolutions

Sources rechecked: October 24, 2026.