The best replacement for ray gun is thunder gun.

The best alternatives to ray gun are rated as following:
★★★★★  thunder gun
★★★★  mustang and sally
★★★  winters howl
★★★  wunderwaffe
★★  hamr
★★  blundergat
★  executioner
★  ray-gun
★  wave gun
★  ray gun 2
  ray gun mark 2
  thundergun

Your alternative for ray gun is not listed? Suggest!
Speaking about ray gun, one probably shouldn't forget about pack a punch.

Other search terms related to ray gun and their ratings are:
★★★★★ pack a punch
You have in mind a companion for ray gun and it is not yet here? Propose!



Google Trends

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ray gun
thunder gun
mustang and sally