They came apart.
Got these for a kid for christmas, they started to come apart on the first couple shots, the heads are not connected well at all, the glue seems to be dried out and they just seperate, this is in a manual firing mega pistol, I didn't try it in any of the electric guns since they put way more stress on the bullets. They do however make a really good whistling noise when fired, that is until they disintegrate.
amazon reviews