I re-read the reply's and didn't notice if this suggestion was supplied, but isn't the gas piston nut staked? If so that may be why he's having trouble removing it, and why another reply was that his was loose (someone had not re-staked after removal/cleaning), just a thought.
And another reason that it could be extremely difficult to remove I hate to say, is that someone cross-thread the damn thing when reassembled, again, just a thought.Information
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