C2478 The System Could Still Use It

There was no need to mention the cannon barrels that were sealed perfectly. Even if it was those ragged goods from the Bear Country, Qin Guan did not have to worry about them. Under the rush of the space-time energy, the cannon barrels would become as good as before.

Now, the exchange, begin!

Qin Guan confidently started the exchange, but the familiar energy fluctuation did not appear