1216

The SRM 1216 shotgun is an American 12ga 16 round, cylinder fed, delayed blowback, semi automatic shotgun

It's manufactured by SRM Arms and marketed to Law Enforcement/Home Defense applications.

Overview
The 1216 is a deadly and effective weapon, being able to fire in a rapid burst of shot. This effectively triples its range, as your followup shot speed is excellent. However, its recoil is rather high, and firing it from the hip is basically a lost cause.

The weapon also has a fairly long delay between bursts, making hitting your shots crucial, or you will most likely be shot dead when the enemy retaliates.