Remington 870 also is very popular police/security shotgun, available with extended magazines (up to 8 rounds),fixed or folding butt stocks or with pistol grips. Usually, police Remington shotguns have 14 in. or 18 in. barrels with cylinder or improved cylinder chokes, capable of firing buckshot, slugs and special purpose munitions (tear gas grenades, non-lethal rubber bullets etc.). M870 may be equipped with rifle-style or ghost-ring (peep) sights, with tactical flashlights and lasers etc.
Taurus Judge - posting to my faves, not to be aggressive, but to share in case someone is interested in what a somewhat 'Stay at home Mom' likes to keep around for home defense. This shoots shotgun shells and .45. Mine is named "Judy" -Mary