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1. Line up the holes in the delta ring and weld spring with the hole in the upper receiver.
2. Turn the gas tube 90 degrees and feed it through the delta ring, weld spring and into the upper receiver.
3. Turn the gas tube upright and push it into the front sight base until the roll pin holes line up.
4. Install roll pin.
5. Done!
It took longer to read the 5 steps than it does to install the gas tube.
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