SIX12 Modular Shotgun | Crye Precision | SIX12™ is a 6-round, 12-gauge, cylinder-fed shotgun that ca, We are very pleased to introduce the SIX12™. Originally designed to provide a safer, faster and more efficient means of breaching doors, the SIX12™ is a 6-round, 12-gauge, cylinder-fed shotgun that can be mounted to most AR platforms.