In Goodsprigs in the home of the doctor near the bed where the game begins.
This rocket launcher uses atomic charges for an atomic explosion. Much faster and more precise compared to fatman.è a great mod I recommend it, great for eliminating every enemy in its path.

INSTALLATION:
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Extract the files to your data folder and activate the ESP.

Normally the data folder can be found in;
Program files / Steam / SteamApps / common / fallout new vegas / date

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UNINSTALLAION:
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Delete the extracted file the. Esp file.