The best replacement for shotgun is rifle.

The best alternatives to shotgun are rated as following:
★★★★★  rifle
★★★★  handgun
★★  pistol
★  handgun for home defense
★  ar15
★  zombies
★  ar
★  zombies hacked
★  carbine
★  ar 15
★  no xplode
★  assault rifle
  pistol home defense
  drone
  handgun home defense
  revolver
  shotgun
  rifle shtf
  22 rifle
  ar home defense
  riot gun
  muzzleloader
  .22
  under center
  lavalier mic
  12 gauge shotgun
  body armor
  sawed off
  rifle recoil
  no explode
  ak 47
  22
  remington shotgun
  .22 rifle
  aa 12
  boom mic
  smg
  semi auto shotgun
  rifle scope
  black powder
  ar-15
  superpump 250

Your alternative for shotgun is not listed? Suggest!
Speaking about shotgun, one probably shouldn't forget about pistol grip.

Other search terms related to shotgun and their ratings are:
★★★★★ pistol grip
choke tube
You have in mind a companion for shotgun and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of shotgun in all years. Click on graph for more.
shotgun
rifle
handgun