I would think discharging a firearm within city limits was a criminal act. Codified that way in most locales.
Crossman repeat air: $45
Also probably illegal to shoot in the city (as most any projectile weapon that requires air or gunpowder to force a projectile from a barrel are), but much quieter than a real gun, so quiet in fact that no one is going to call 911 to report it since they won't hear it.
You could also take the entire cage and submerge it under water for 5 minutes. That will kill them also, quiet like.
Crossman repeat air: $45
Also probably illegal to shoot in the city (as most any projectile weapon that requires air or gunpowder to force a projectile from a barrel are), but much quieter than a real gun, so quiet in fact that no one is going to call 911 to report it since they won't hear it.
You could also take the entire cage and submerge it under water for 5 minutes. That will kill them also, quiet like.