Liu Zhenhan looked at the bronze firegun before him, and couldn't help but express his deep respect for the two masters from ten thousand years ago.
As for the magic array on the hammer, Liu Zhenhan had a hunch. To verify his idea, he picked up a small stone, shaped it into a mulberry egg shape with a dagger, and stuffed it into the barrel of the bronze firegun. He pulled the trigger and with a 'clink', the stone indeed flew out. There was a bit of noise in the gun barrel, probably a poor fit between the projectile and the lands and grooves.
Liu Zhenhan fired the gun at the snow on the ground, a gust of wind echoed from the barrel, clearing an area of about five feet, snow powder flew everywhere, and even the small stones hidden under the grass were blown away.
