In firearms, catastrophic failure usually refers to a rupture or disintegration of the barrel or receiver of the gun when firing it. Some possible causes for this is the gun being out of battery, having improper headspace, using incorrect ammunition for the firearm, using ammunition with an incorrect propellant charge,[1] an obstructed or partially obstructed barrel,[2] or weakened metal in the barrel or receiver. A failure of this type, also known colloquially as a "kaboom", or "kB" failure, can pose a threat to the user and bystanders.
A bit over stated in the title of the post.
As post