C535 Elder Mu Came(part I)

"Grandpa, you've worked hard. It's only been a few days, but you've already finished modifying my weapon. I'm sure you haven't rested for a long time"

Zhang Fann felt a little guilty when he heard what Mu Feng said.

After all, his weapon had already reached A9. If he wanted to upgrade it, the requirement for materials was very high, and it would take a lot of effort