As you open crates or make purchases from the various in-game stores, you’ll come to acquire an array of lightsaber parts and paint jobs, as well as interchangeable parts and materials for BD-1. Once you’ve received the blaster from Bode during the story, you’ll then be able to customise this at any workbench. Just make sure to swap out all parts of Cal’s lightsaber, blaster, and BD-1, and this will unlock. Having said that, we managed to unlock this by merely attempting to customise the blaster’s barrel, trigger, and handle, so you may not need new parts for it after all.