What is the first step to clear a stoppage if the bolt is locked to the rear?

When the bolt is locked to the rear, the first step to clear a stoppage involves releasing the magazine. This is critical because, typically, the reason for the bolt being locked back may be an empty magazine or a magazine-related issue. By pressing the magazine catch and removing the magazine, you can then assess whether a round is blocked or if there's a feeding issue, and it allows you to resolve the error safely.

Once the magazine is removed, you can inspect the chamber and receiver for any obstructions, or address any issues with the ammunition. After clearing the potential blockage and ensuring everything is functioning correctly, a filled magazine can be inserted, and the bolt can then be released to chamber a round. This sequence emphasizes the importance of addressing the magazine first when the action is locked back, ensuring that all subsequent actions are executed with the weapon in a safe and functional state.