Wow this is quite shocking to me. I just heard about this post here so i logged in to check it out.
I'm pretty amazed really. The exterior of the Tornado isn't made of anything that spark when impacting concrete or even steel. Nylon shell halves, and aluminum cap is pretty non sparky.
I need to see that grenade ASAP so I can see if I can replicate the feature in next generation products.
Seriously though, I'd like to exchange that grenade with a new one ASAP Foxfels. Hit our contact page to arrange a return. We'll be happy to reimburse you for your costs shipping to us and ship you a new 'nade.
http://www.airsoft-innovations.com/pages/contact-us