Which of these weapon platforms is best for home defense, (pistol, shotgun, m4) and why? Also, what specific "brand" (pistol, shotgun, m4) do you keep for HD? Lastly, if you care to elaborate on your ammo used in said weapon of choice ie...nighthawk grp w/x300 load is WRT 230 +P and why? Or Remington 870 w/ 00 buck and why? Thank you for your insight!