This Perk affects any type of automatic weapon, so long as it doesn't fall into the big guns category (Gatling Laser, Minigun, Fat Man, MIRV, Flamer).
Does Heavy Gunner affect Gatling laser?
And from the wikia page on the Heavy Gunner perk, the guns affected by this perk are: Minigun. Gatling laser.
What guns are affected by commando fallout 76?
Modifies weapons
- 10mm Submachine gun.
- Assault rifle.
- Combat rifle.
- Enclave plasma gun.
- The Fixer.
- Handmade rifle.
- Laser gun.
- Pipe gun.