M26 12-Gauge Modular Accessory Shotgun System (MASS)

M26 12-Gauge Modular Accessory Shotgun System (MASS)

Enhances Soldier effectiveness with lethal, non-lethal and door-breaching capabilities via a single compact, lightweight shotgun that can be attached to a host weapon or used as a stand-alone system.

The M26 MASS is a 12-gauge, bolt-action, magazine-fed shotgun. The M26 provides added lethality, flexibility and operator level modularity to ensure the combat overmatch of the fighting squad and further increases Soldier survivability. The system can be attached underneath the barrel of the M4 Carbine and provides a capability equivalent to a stand-alone shotgun without carrying a second separate weapon. The M26 can also be converted without tools to operate in a stand-alone mode with no loss in functionality.

The M26 MASS comes with a recoil-absorbing, collapsible buttstock. The Picatinny rail on top allows attachment of accessory equipment to the shotgun. The bolt handle (charging handle) can mount on either side for ambidextrous handling. Additional features include a box magazine, flip-up sights and an extendable stand-off device for door breaching.


  • Caliber: 12-gauge
  • Weight: 3.5 pounds (attached mode, empty); 5.3 pounds (stand-alone, empty)
  • Length: 16.5 inches (attached mode); 26.5 inches (stand-alone)
  • Range: ammunition specific