This is the first time Glenn's kitchen is seen.
Joe fires a shotgun at Peter. The standard ammo for a 12 gauge consists of a bunch of small metal beads called shot. The size of the shot, the number of beads per cartridge, even the metal used in the beads varies. There are also shotgun ammos firing slugs and sabots, which are single, solid bullets and some of them look like what Joe fires. A 1 ounce slug for a 12 gauge shotgun (pretty standard) would punch a very wide hole all the way through a man's body and into whatever is behind him.