M26 Modular Accessory Shotgun System

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.

M26-MASS (Modular Accessory Shotgun System)
The M26-MASS configured under the M4 carbine.
TypeUnderbarrel Shotgun
Place of originUnited States
Service history
In service2003–present
Used byUnited States
WarsIraq War
Production history
DesignerIra M. Kay
Designed2002
ManufacturerC-More Competition
Produced2011
VariantsXM26
Specifications
Mass3 lb (1.36 kg) underbarrel
5 lb (2.26 kg) with collapsible stock
3.5 lb (1.58 kg) stock removed
Length16.5 in (419 mm) underbarrel
26.5 in (673 mm) stock extended / 24 in (610 mm) stock collapsed
18 in (457 mm) stock removed
Barrel length7.75 in (197 mm)

Caliber12 gauge
ActionManually cycled straight-pull bolt action
Feed system3 or 5-round detachable box magazine
SightsUnderbarrel configuration:
Zeroed for host rifle M16/ M4 sights
Stand alone configuration:
Flip up non-adjustable iron sights or MIL-STD-1913 rail attached optic
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