Ashmaker

The 'Ashmaker' is a unique Minigun found in Fallout4. It has similar stats to the base 5mm minigun however its unique ability sets fire to enemies for 15 points of damage

Location
To obtain 'Ashmaker' you need to complete the 'BIG DIG' Questline with Bobbi No-nose. At the end of the quest you are confronted by some guards who tell you to go back. If you convince Bobbi to leave you will be awarded with 'Ashmaker'