Gnasher Shotgun

COG WEAPON

The Gnasher Shotgun is a deadly weapon at close range and–like the Lancer--it's a popular choice among players. It's capable of inflicting one-shot kills to all but the largest of Locust units. And even though it is generally meant for short range combat, it can also do damage at medium range. 

The Gnasher was first introduced in Gears of War 1.