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Sometimes you have to look at the junction where the tube goes down into the sight/trunnion area. Look at the way the latch inside the trunnion is oriented . Make sure it's straight up and down. Sometimes when you move the lever up for take down, the latch is still a little out of line and the gas tube won't drop back in. You may have to move the lever while pushing the tube to see if the latch is actually lining up to let the tube fall in properly.
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