What is the correct sequence when performing the firing pin protrusion test on the M203 grenade launcher?

The firing pin protrusion test on the M203 grenade launcher is essential to ensure the weapon functions correctly and safely. In this test, the correct sequence begins with cocking the weapon, which prepares the firing mechanism for the next actions. Following this, the barrel is moved forward, allowing access to the firing pin. Removing the self-locking screw is necessary for testing the firing pin's protrusion since it holds the firing mechanism in place. Finally, squeezing the trigger will activate the firing pin, allowing the test to be conducted properly.

The emphasis on this specific order is crucial because each step is designed to maintain safety and ensure accurate testing of the firing mechanism. Any deviation from this sequence could result in inaccuracies in the test or safety hazards during the procedure.