What is an essential practice following the cleaning of the M16A3/M4A1?

Conducting a basic function check after cleaning the M16A3/M4A1 is essential to ensure that the firearm is operating correctly and safely. This process involves functioning the weapon to verify that all systems are working as intended, which includes checking the safety mechanism, the trigger, and ensuring the bolt cycles properly. It's a crucial step to confirm that any issues arising from cleaning, such as improper reassembly or the presence of cleaning residue, do not affect the performance of the rifle.

Following this procedure provides confidence that the weapon is in working order and ready for use, especially in a training or operational environment. While storing the rifle safely, painting for protection, or replacing parts may have their own importance, they do not directly follow the immediate necessity of ensuring a clean weapon is operable. The basic function check helps identify potential problems before the firearm is needed, thus enhancing safety and reliability.