Ok, this idea is twofold.
1: Torgue “Torpedo” style pistol and shotgun barrels. Shotguns are carnages. Pistols are also carnages, but smaller. Lower the ammo consumption of the regular torpedo. Add a “Regular” torgue rifle barrel. (A Carnage rocket launcher barrel is both stupid and should totally happen. Who knows what kind of insanity that would cause).
And a Legendary Boomstick. Because Carnages (Consumes multiple ammo, fires a spread of rockets per shot, is totally a safe weapon for use).
2: Jakobs: “Masher” barrels. Masher pistols, Masher Assault Rifles, Masher snipers, MASHER SHOTGUNS.