Cleaning my M2 today after hunting in the cattails and noticed the barrel extension was loose. Upon further looking I noticed a section of the threads was missing, that probably happened when the extension loosened up while shooting. Don't know when it happened, last time I had the barrel off was a month ago and I usually don't grab on the extension like I happened to tonight. It could've been loose for awhile but I know the piece hasn't been missing for long.
Guess I get to call Benelli in the morning and see if their CS is as bad as some say it is. I can't remember if I registered the gun when I bought it so I hope they don't balk if I didn't.
Thank god I bought an extra M2 this summer so I have something to use in the meantime. Might just swap the barrel over from the new one since I'll be getting a new barrel from the looks of it anyway. That way I can keep the backup unfired for now.
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ETA. Forgot to mention the gun is a year and a half old with 2600rds through it so it's by no means wore out.