Final answer:
When turning in an M870 shotgun to the armorer, it must be in a clear and safe condition with the action open, chamber and magazine tube empty, allowing for easy inspection.
Step-by-step explanation:
When turning in an M870 shotgun to the armorer, it is essential for safety and protocol that the shotgun be in a clear and safe condition. This typically means the M870 should have its action open (pump action should be in the rear position to expose the chamber), the magazine tube should be visibly empty, and there should be no shell in the chamber. The gun's position should allow the armorer to easily inspect it and confirm that it is unloaded and safe to handle. Military and law enforcement personnel are trained to handle and turn in weapons with strict adherence to safety procedures to prevent accidents and ensure the safekeeping of the firearm.