3 lb (1.36 kg) underbarrel 5 lb (2.26 kg) with collapsible stock 3.5 lb (1.58 kg) with stock removed
Length
16.5 in (419 mm) underbarrel 26.5 in (673 mm) stock extended / 24 in (610 mm) stock collapsed 18 in (457 mm) stock removed
Barrel length
7.75 in (197 mm)
Caliber
12 gauge
Action
Manually cycled straight-pull bolt action
Feed system
3 or 5-round detachable box magazine
Sights
Underbarrel configuration: Zeroed for host rifle M16/M4 sights
Stand alone configuration: Flip up non-adjustable iron sights or MIL-STD-1913 rail attached optic
The M26-MASS (Modular Accessory Shotgun System) is a shotgun configured as an underbarrel ancillary weapon attachment mounted onto the handguard of a service rifle, usually the M16/M4 family of United States military, essentially making the host weapon a combination gun. It can also be operated as a stand-alone shotgun by attachment to a pistol grip/collapsible buttstock module. Rollout commenced in 2013, replacing the M500 shotguns in service.[2]
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Parsons, Dan (1 January 2013). "Army, Marine Corps Succeed in Rapidly Fielding Specialized Individual Weapons (UPDATED)". National Defense. Retrieved 11 March 2018.
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