Quoting something I've found in the internet: [quote]You need weapon frames to forge the weapons. You can buy those from Ada-1 after completing a weekly bounty and receiving a ballistic log. Once a frame is made radiant, go to the corresponding Forge to craft it. The Forge boss must be killed yo get the weapon. Volundr is Machine Gun, Auto, and Sword. Gofannon is Sniper and Handcannon. Izanami is Pulse and Bow[/quote] And yes, it works.