Nerf guns were a literal blast to play with as kids… until someone ultimately took a plastic dart to the eye. Well, those kids have grown up and a few of them became engineers — NASA engineers to be a little more specific.

Former NASA engineer turned YouTuber, Mark Rober (and pals), have created the world’s largest functioning Nerf gun. Watch your childhood dreams come true with the video in the player above.

Then watch his friends from Eclectical Engineering swap the air system for black powder, turning this Nerf gun into a cannon below.