How do I make flak cannon particles not bounce against the wall?

I just want the particles to hit the wall and then fall down like a shotgun. How would I go about doing that?

Place an event hit node then check if it’s hitting a wall. Then set the velocities of flak chunks to zero.

What do I put the event hit on? The Flak Cannon or the Shards themselves?

On the shards themselves of course.