Very strong design. I did not have a single prototype damaged by a strong throw against a wall or floor.
My real concern is users throwing grenades into someone else's face. I tried my best to keep the thing light, but 180bbs and gas have a finite weight which can still hurt if you get directly beaned. I had someone throw grenades at my head to see if they could dislodge my goggles a bunch of times. It hurt my face when he missed the goggles, but good pball goggles were very difficult to dislodge. I wish I had a mannequin head.
Want nearly free GBB gas?