OFPD-0004

Which direction, and how far, are clues. Track them with a new rifle, and if they ever change, you know something is up.
The origins of the gas flow. The gas gets vented out of the barrel, through the front sight housing, and down the tube towards the carrier key.
After reassembly, your clues of which direction, and how far, should be the same as when your rifle was new.

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