This is a comic that was given to troops during Vietnam when the M16 rifle was issued.  The steps on clearing a jam have not changed.  This is an interesting piece of AR15 history should live on.  No m4, ar-15 owner is complete without knowing the steps needed should a jam occur.  Hopefully your rifle never jams but if it does know how to fix it quickly.   Most jams occur due to lack of proper ar15 cleaning or poor quality ammo.