I have several 331 weapons ready for hard mode: Über Gjallarhorn, Ice Breaker, Another NITC, Hawkmoon, Murmur, and Suros Regime.
Once I have the sufficient Radiant Energy, Black Hammer, Song of Ir Yût, Hunger of Crota, and Swordbreaker will be ready as well. Though I'm gonna focus on maxing out Black Hammer first, follow by either Hunger of Crota or Song of Ir Yût.
I like the current setup I have:
Primary:
Another NITC
Zen Moment + Hammer Forged + Third Eye
Special:
Black Hammer with Perfect Balance though I may switch to Flared Magwell
Plus I may switch it with my Solar LDR 5001 with Unflinching, Field Scout, and Clown Cartridge once I max it out.
Heavy:
Gjallarhorn
Still wish Another NITC had a burn to it.