What are you damage settings set up like in your destructible? Have you set up the collision properly for the destructible and the projectile? The projectile (assuming you’re using the yellow ball projectile form the first person template, right?) needs to have the collision capsule set to overlap with destructible and the destructible will need to be set to overlap with projectile in the collision presets. This will generate an event when they overlap so that impact damage registers to trigger the applied damage.