Favorite: For outdoors, Remington 870 with 20" rifle sight barrel and magazine extended to barrel length. For indoors, the same thing, but with a 18" bead sight barrel.
No ninja gear, nothing that uses batteries, or requires a picatinny rail or has a shock absorber, etc.
The person who has nothing for which he is willing to fight, nothing … more important than his own personal safety, is a miserable creature [with] no chance of being free unless made and kept so by the exertions of better men …. John Stuart Mill