Instructions
Remove the rifle's magazine by pressing the magazine release switch located in front of the trigger guard. Push the square button located on the end of the upper receiver into the body of the weapon and lift off the receiver cover. You will see that the button is part of the recoil spring guide.
Press the recoil spring guide forward and lift it off its seat in the receiver. Remove the spring guide.
Pull the bolt carrier assembly to the rearmost position with the operating handle, lift the assembly upward and back to remove the bolt carrier assembly from the receiver.
Remove the bolt from the bolt carrier by twisting the bolt so that the lug on the bolt is free of the cam path in the bolt carrier.
Turn the gas cylinder locking switch, located at the rear of the hand guard on the right hand side of the weapon, upward. Lift the hand guard and gas tube off the front of the weapon.