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Message: <blockquote data-quote="Rickshaw" data-source="post: 64219" data-attributes="member: 23537"><blockquote data-quote="buzz_knox"><blockquote data-quote="rickshaw">You'll note that it utilises metal cased rounds.  The problem with most semi or fully-automatic shotguns which utilise standard shotgun rounds which are plastic cased is that they suffer badly from cook-offs.  The need to go to metal cased rounds was one of the things which basically killed off the weapon concept IIRC.</blockquote>I thought the metal case was 1) because this was a higher pressure load than for standard shotguns and 2) to insure that they would not chamber in standard shotguns (due to issue no. 1).  While cook-offs are not uncommon in high volume fire with closed bolt weapons, I've never heard it as an issue with shotguns.</blockquote>If you look on youtube, you'll find severel videos of semi/fully-automatic shotguns which use plastic cased rounds.  Invariably towards the end of the video, there will be a cook-off.   The articles I remember reading from the 1980s invariably mentioned this was a problem with the weapon during early testing with plastic cased rounds.</blockquote>