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Edit. If a upper handguars rattles, not the tube itself, you can add a curved leaf spring that fits over the gas tube and on the inside of the handguard. Same sources as above.
Look for gas tube spring on Leesmags or Numrich. It slips on the receiver end of the gas tube and keeps it tight against the gas block.My gas tube rattles now that I don't have the Hogue and plastic HGs on it... Is the only solution Paki tape?
Or is there another part I'm missing? Maybe some sort of springy thingy inside the metal upper HG?
Edit. If a upper handguars rattles, not the tube itself, you can add a curved leaf spring that fits over the gas tube and on the inside of the handguard. Same sources as above.
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