When observing the chamber, one should...

In the context of firearm safety, observing the chamber is a critical step in ensuring safe handling practices. When checking the chamber, one should remove any visible obstructions. This is vital because obstructions can create hazardous conditions, such as misfires or injuries, if the firearm is discharged while obstructed.

While verifying that it is loaded, checking for modifications, and ensuring the chamber is clean are important aspects of firearm safety, they do not specifically address the immediate need to clear the chamber of any potential hazards. An obstruction can prevent the proper functioning of the firearm and poses a safety risk to the user and those nearby. Therefore, emphasizing the removal of any visible obstructions reflects an essential practice in maintaining safe firearm operations.