Attachment Kits and weapon rarity replace the custom-loadout loop in this mode.
The official Black Ops Royale deep dive describes preset weapon archetypes. Scavenged Attachment Kits improve a weapon through rarity upgrades and add attachments along its path. There are no custom Loadouts, Buy Stations or Gulag in these documented rules.
Check the weapon’s upgrade path on the HUD before spending time on a swap. Our advice is to upgrade a role you can use reliably, then cover a different engagement distance with the second weapon. Do not follow a custom-loadout guide without checking whether its rules apply.
Artwork: Call of Duty / Activision. Source links below.