IWI Tavor TS12 Bullpup Semi-Automatic Shotgun. The Tavor TS12 12 gauge shotgun is a gas-regulated bullpup shotgun with an innovative design that feeds from one of three (3) individual magazines which can hold four 3-inch shotgun shells or five 2 ¾ inch shotgun shells each. This means that the potential overall capacity from all three (3) individual magazines is 15 rounds plus one additional round in the chamber (Using 2-3/4″ shells). The TS12 has a unique feature that automatically loads a round in the chamber once the subsequently loaded magazine is rotated into position. It can be fed and unloaded from either side. The TS12 offers an innovative versatile and compact sporting or home defense shotgun that is optimized for whatever application you need.