10mm submachine gun (Fallout 76)

The 10mm SMG is a weapon in Fallout 76.

Locations
You can find the plan for the 10mm SMG by completing a quest called "Cold Case" which is found in the waterpark NW of Grafton. There is a Mr. Handy in the park that will give you the quest. Completing it will give you the plans to make the weapon as well as an SMG variant that adds burning damage.