1. Any shotgun used by the US Military (i.e. M1014, Mossberg M500 Series, M26 MASS or Knight's Armament Company Masterkey) that is used for door breaching, and subsequentially room clearing in Urban Environments
2. A large sledgehammer/battering ram/APC that is capable of knocking down doors or gates in order for infantry to gain access to said building.
SSgt: "Private Daniels, what you got there?"
Pvt Daniels: "New M26 MASS, Staff Sergeant. Thing is an Iraqi Eviction Notice."
*laughing*