Chen Shi said, "Can we come in?"

Zhang Rui stepped aside from the door. "It's messy. I hope you don't mind."

The room wasn’t big. The most conspicuous part of the house was a worktable, on which some small parts and scraps were placed. The cabinet next to it had tank models and simulation guns, some of which were welded out with iron plates.

Noting his gaze, Zhang Rui explained, "I usually like to play with little things like this."

"Have you ever made a real gun?"

"Real gun?" Zhang Rui leaned on the table and lit a cigarette. His two thick eyebrows were scrunched together. "The principle of a real gun is very simple, but the bullets are more difficult to make than the gun, so the average person builds a gun that uses steel bullets. It’s called...