1-6 Disassemble the Rifle
Remove the buffer and action spring separating the buffer from the spring.
Release the buffer by pressing the buffer and depressing the retainer.
Lift out the extractor and spring, taking care so that the spring does not separate from the extractor.
Remove the extractor pin by pushing it out with the firing pin. (Use care not to damage the firing pin)
Pull the bolt assembly from the carrier.
Remove the bolt cam pin by turning it one-quarter turn and lifting it out.
Remove the firing pin by allowing it to drop out of the rear of the bolt carrier into your hand.
Put the bolt assembly in the locked position by pushing in the bolt.
Remove the firing pin retaining pin.
Remove the charging handle.
Remove the bolt carrier and bolt.
Pull back the charging handle.
Separate the upper and lower receivers.
Push the receiver pivot pin.
Push the takedown pin as far as it will go and pivot the upper receiver from the lower receiver.
Remove the handguards only if you can see dirt or corrosion through the vent holes. Handguards on the M16A2 are interchangeable because they are identical.
Remove the sling.
Verify that the rifle is clear.