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How do these things ever work?
Trying to restore the air-seal on my MP5K, we're talking tiny fractions of a mm in barrel alignment between "won't feed" and ""dribbles out".
Never, ever replace the stock parts in your gnu. Ever.
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Ironically from going too hot it's now weak tea. Those MP5K hop units are cray cray, they don't seem to want to match the profile of any hop rubber that I've tried, and I'm not even sure where the original has gone.
Well, after hours of fiddling it's working fine in the garage now. What could possibly go wrong on the way to chrono.