So for the longest time i have wondered what the problem was with this weapon, by function it seems legit as a combat shotgun. I have even heard that you can use the drum mag as an improvised land mine.

So why hasnt any military force adapted this awesome weapon?

And yes i am aware that only a few prototypes were made.

Im also interested in how this gas operated semi auto shotgun actually works, the interwebs has kinda limited info.