There is a poll on MapleStory 2 webpage where they allow you to slightly change the content of the game ( skill names etc.) They have released a teaser of Heavy Gunner & they're asking what name should be given to this skill. The answers are in a poll. The skill name has 2 words

1st word
  • Electric
  • Lightning
  • Hyper
  • Laser

2nd word
  • Shock
  • Cannon
  • Blast
  • Launcher

I would personally go with Hyper Blast