Our drone was designed from the ground up to be the most durable airframe available to the drone hobbyist and small UAV pilots, and I really think we have achieved that goal. We have stomped on it, thrown it into walls and through windows, dropped it from hundreds of feet, flown through fire, landed on water and crashed literally hundreds of times. And we also shot it several times at close range with a 12 gauge shotgun loaded with heavy dove ammo, and although it was knocked out of the sky and one motor/prop was destroyed by the shot, the airframe was little more than scuffed - and was up and flying within 5 minutes with a new motor and fresh zip-ties.
Several people have pointed out that a different gun or ammo would destroy it, or leaving it in a sustained fire would melt it. These are true, so it is not technically indestructible. However, in our extensive torture testing, we have seen our airframes survive abuse FAR in excess of that you would expect to encounter in normal action-sports drone flying.
So, Is it indestructible? No.
The World's Toughest? You will have to judge for yourself...