Just as the title says. It looks like it’s applied when you’re customizing that loadout, but when you’re in a match those parts have the default shader. You can also see this in the customization menu’s loadout selection screen. Highlight a different loadout, then highlight the one with the shader. You should see that it isn’t applied in the areas I mentioned. The top of the right gauntlet is harder to see in this menu since you can’t rotate the model, but the plasma caster is clearly visible.