An audible pop occurs when only a portion of the propellant is ignited. It is normally identifiable by reduced recoil and is sometimes accompanied by excessive smoke escaping from the chamber area. To clear the rifle in a combat environment:
Place the rifle in Condition 4. Move take down pin from left to right as far as it will go to allow the lower receiver to pivot. Remove the bolt carrier group. Inspect the bore for an obstruction from the chamber end.
Insert a cleaning rod into the bore from the muzzle end and clear the obstruction. Reassemble the rifle. Conduct a reload. Sight in and attempt to fire.
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