This story has a solid plot and I could follow along. The idea of a Jackal traveling the galaxy to gain knowledge to use in his mission is fun and I understand the intent of the story to the mystery of his unconventional weapon. That said, with space left for more writing, I think paying off on that mystery of his weapon would have really helped the story. At the very least, hinting beyond it being heavy and technology from other races would better allow the reader to draw their own conclusions on what this great device was to help in his mission.
I'd love to see this story expanded in the future, should you choose to do so.