What is the correct procedure to follow when inserting the trigger housing assembly?

Inserting the trigger housing assembly correctly is crucial for ensuring the reliable operation of the firearm. The procedure involves carefully aligning the components to ensure they fit together properly.

In this case, the correct choice involves inserting the holding notch into its designated recesses. This step is fundamental because it ensures that the trigger housing assembly is adequately seated in place. The holding notch is designed to fit precisely into the recesses, which aids in maintaining the structural integrity of the assembly. This alignment is necessary for the trigger mechanism to function correctly without interference or misalignment, which could affect the performance and safety of the firearm.

Once the holding notch is properly seated, further steps such as securing the assembly with bolts can be conducted; however, proper initial insertion is the critical first step in the process. This methodical approach contributes to the overall safety and effectiveness of the firearm operation.