枪是藏在地下实验室的吧，第五集Gus把枪拿出来了
> Act IV: Mike and Gus climb down into the excavation beneath Lavandería Brillante, which has been abandoned since the death of Werner Ziegler. Mike assumes that Gus is considering using the excavation as a potential hiding spot. After Mike is excused upstairs, Gus is left alone to survey the excavation. He picks up and examines a power cable, then **plants his handgun in the caterpillar treads of an excavator**. Seemingly satisfied with the plan he has come up with, Gus climbs out of the excavation and shuts off the lights.
Better Call Saul Season 6
> Act IV: Mike and Gus climb down into the excavation beneath Lavandería Brillante, which has been abandoned since the death of Werner Ziegler. Mike assumes that Gus is considering using the excavation as a potential hiding spot. After Mike is excused upstairs, Gus is left alone to survey the excavation. He picks up and examines a power cable, then **plants his handgun in the caterpillar treads of an excavator**. Seemingly satisfied with the plan he has come up with, Gus climbs out of the excavation and shuts off the lights.