I can’t reliably confirm the exact in-game steps for Aladia PvP from the sources I have here, but the usual way to equip a new gun in games like this is:

  1. Open the menu / loadout / inventory screen.
  2. Go to your weapons or loadout tab.
  3. Click the gun you own.
  4. Select the slot you want to replace.
  5. Confirm or save the loadout.

Common reasons it won’t equip:

  • The weapon is locked behind level, class, or rank requirements.
  • It only works in a specific slot.
  • You need to buy or claim it first.
  • The game requires you to unequip the old gun before swapping.

For a quick test, look for any button labeled Loadout , Inventory , Weapons , or Equip , then try tapping the new gun and checking whether the game shows available slots. If you want, I can turn this into a short step-by-step phone guide or a PC guide.