Superbad459 Posted May 26, 2019 Share Posted May 26, 2019 I just brought home a Benelli M4, I Field strip and cleaned and lub it up last night And I can hear gas piston rocking back-and-forth as i lifted the barrel up and down. Is this normal? I followed the owners manual and I watched a YouTube video on how to do it as well. Quote Link to comment Share on other sites More sharing options...
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