Speak softly, but carry a Fusion Gun! Now that's what I call a weapon slogan for Fallout 4.
This energy weapon is one of the best I've installed for Fallout 4. This is the Fusion Gun. You can find this mod on the 3DM Game website at the following link below.
possess 1980 deserves credit for the port of this mod to 3DM Game. But falloutsuite is the original mod author of this weapon mod. The original mod author's Nexus page is linked below.
Note: If you're still having trouble finding the weapon, EpicCRAZY WOLF made a video on how to obtain the weapon. This video link below is for those who use the 3DM Game link and Xbox One users only.
Honorable mention: If you prefer to translate the mod from Russian to English, Stalker Boss ported this mod to Gamer-Mods.RU. The link is listed below.