Projectiles going through walls and floor

How do i get my projectiles to stop passing through world objects? Ive tried just about everything i can to stop it from happening. Basically i need my hand grenades to stay where they land after i throw them.

Some more info might possibly help such as if you used any templates and screen shots of your blueprints/code. Anyways the first thing to check is if your projectiles have collision components. Here’s an example where I migrated the MyProjectile blueprint from the third person template into the top down template. I’ve got the blueprint open with the viewport window selected.