Military M-12 Close Assault Weapon

Military M-12 Close Assault Weapon is shotgun. "Close Assault Weapon" is a military euphemism for shotgun. Formerly outlawed by the now-extinct Geneva Convention, combat shotguns are common sights in 2020. The M-12 is a development of the first combat automatic shotgun, the Olin/H&K CAWS of last century. Its differences include a larger, rotary cassette magazine and a new selector switch (the firer can choose which kind of round he wants to shoot, but this reduces the shotgun's ROF to 1 for that round; otherwise he gets his rounds in predetermined order). Due to the great variety of rounds being used in combat shotguns and the M-12's selector switch, the old epithet "Dial-A-Gun" has been resurrected and applied to the M-12, so a soldier armed with an M-12 is a "Dally-Gunner.".

Source

 * Home of the Brave, pg.83
 * Blackhand's Street Weapons, pg.22