Hi guys, so im trying to figure out the feasability of a magazine loaded semi auto 12 gauge pistol. Im refering to the 1 3/4 rounds that have come out for home defense. I searched around and the only firearm i was able to locate that was magazine fed 12 gauge through the handle was the Mag7. But the problem as im aware is the size. You can barely fit your hand around the grip. But even that gun is a pump action. Those rounds are also on the smaller side. i believe 60 mm? i think normal 12 gauge is 70mm roughly? Anyways I was looking at psi for 9mm and in comparison the 1 3/4 loads psi is very low around 14-15 thousand? I honestly am not a gun smith and have only gotten into guns in the last two years but I was wondering if there is any reason you could build a semi auto pistol specifically designated for that size round? any input is most appreciated. thank you.