[header] How to field strip a m 16 service rifle [title] Lock the bolt to the rear. [step] You will need to depress the lever on the charging handle and pull the charging handle all the way rearward. While holding the charging handle all the way in the rearward position you will need to push the bottom portion of the bolt catch located on the left side of the magazine well. 
[title] Push the rear dis-assembly pin, located above the pistol grip. [step] This will allow the rifle to pivot on the forward dis-assembly pin for a " shot-gun " effect.