I couldn’t verify a Marine Academy-specific grenade launcher method from the available results, so I don’t want to guess and give you bad info.

What I could confirm

The search results mostly pointed to other Roblox games or unrelated grenade- launcher guides, not Marine Academy itself. That usually means the weapon may be tied to a gamepass, a shop purchase, a class unlock, or a limited event in that game, but I can’t confirm which one from the sources I have.

Best next checks in-game

  • Open the shop , armory , or loadout menu and look for a grenade launcher unlock.
  • Check whether it is behind a gamepass or premium weapon pack.
  • Look for rank , level , or class requirements in the weapon menu.
  • Search the game’s official group , Discord , or recent update notes for unlock changes.

Practical tip

If you want the fastest route, check the weapon selection screen first: in Roblox games, explosive weapons are often hidden as a separate unlock, a higher-tier variant, or a paid item rather than a default spawn.

If you send me the exact Roblox experience link or the in-game weapon menu screenshot, I can help narrow it down.