waiting
there has been lots of great developments but none really ever caught on. I think mainly because of the design of the shotshell itself....it's heavy, bulk, rimmed and is also semi flexible and can potentially deform or swell. Also they vary in pressure depending on payload of the round which can really affect semi auto or full auto function. Also ultimately its always been a back burner weapon for the military.
Here are some interesting designs:
SOF (MIWS)
Swatriplex 18
Striker 12
MAG-7
SPAS-15
Pancor Jack Hammer
AA-12
Neostead
SAIGA-12
Of course newer Kel tec KSG and UTAS 12 (but these are more or less copies of earlier designs but took 30 years to finally catch on)
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