Read an article of foxnews that said this:
What kind of shotgun fits in a glovebox and accepts 35rd mags of 12ga ammo?!A loaded 12-gauge shotgun was found in the glove compartment of the Honda Civic Lanza drove to the school with two magazines containing 70 rounds of winchester 12-gauge shotgun rounds.
I hope that's a typo. Heres the article:
Newtown gunman spent more than 150 rounds, killed victims within 5 minutes | Fox News