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You didn't say what the exact problem was,but I assume it is not cycling.Check to make sure the gas seal assembly is in correctly.It will not work if any part is backwards.Not to insult you,but I have seen more than one in that condition! Also check the forearm support.That is a little clip that rides on the two rails.If it is chipped or broken,the arm will not cycle.I doubt that your problem is the o-ring. Hope this helps.
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