Credit goes to FreightTrain85, TKx, Jacob is king, Forseti 96 for finding the glitch and/or recording.Credit goes to mug for creating an excellent, beast vid tutorial.
Here it is:



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Text tutorial:
1. Go to the bottom of the light house near AK74 and
do NOT open the bottom lighthouse door

2. Go to right of the stairs to the door(if you facing it)
then turn around and slightly move onto the edge of the
ledge on the stairs.(you will feel a slight bump)(dont go
to little off or on it)

3. Point your crosshairs at the bottom of it near the shadow
(like in the videos)

4. Move back as far as you can until you cant move anymore
(you will hit a rock).

5. Now move your gun freely but not your person and watch
them walk past!

6. If you open up the lighthouse through phd and buy the debri
to downstairs then they will build up behind the door and you
can shoot them!

Plus rep and thanks are much appreciated for all the hard work
i spent trying to find this. Anyone who wants to play with me later just leave your gt and what time you wanna play later.
8)