When can you fully upgrade your ithica shotgun in Resident Evil 5?

In Resident Evil 5, you can fully upgrade the Ithaca shotgun by the end of Chapter 5-3. To achieve this, you must collect enough Upgrade Points (also known as "Gold") throughout the game and complete the necessary upgrades at the appropriate workbench. Ensure that you prioritize upgrading the Ithaca's power, capacity, and reload speed to maximize its effectiveness.