Beretta AL 390 noise

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Beretta AL 390 noise

Postby 12gaugeLarry » Tue Feb 08, 2011 6:37 am

Can anyone offer me their opinion on a noise I'm hearing from my Beretta AL 390. I locked the bolt open and heard what I believe is the piston sliding back and forth as I raised and lowered the muzzle 45 degrees each way. I don't remember hearing this noise before with this gun or with any other semi-auto shotgun before? It seems like there would be a spring that would hold the piston in place when the bolt is locked open. I have shot the gun recently and it worked flawlessly as usual. I have not cleaned it. Please let me know your opinion if you have an AL 390. Thank you!
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Re: Beretta AL 390 noise

Postby bulldog18 » Tue Feb 08, 2011 8:21 am

Sounds like the gas cylinder piston is moving up and down on its shaft. It is normal for it to move. No spring needed to hold in place because it is pushed in place when the bolt is closed. To verify, open the bolt and remove the forend and see if it is moving when you tilt the gun.
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Re: Beretta AL 390 noise

Postby Wolfe » Tue Feb 08, 2011 10:04 am

It's old Part number 48 there: ... eal390.pdf

Is your 390 the synthetic stocked Wal-Mart variety? (Mine is, and I love it)
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Re: Beretta AL 390 noise

Postby Kurt Lehman » Tue Feb 08, 2011 11:26 am

Thats normal for any Beretta auto Al series all the way to the 391 series just the gas piston sliding on the guide rod.

Kurt Lehman
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Re: Beretta AL 390 noise

Postby Silquin » Tue Oct 08, 2013 7:40 pm

Why all of the sudden does this happen ? Sorry it's been 7 years since this post haha
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Re: Beretta AL 390 noise

Postby copterdoc » Wed Oct 09, 2013 3:18 pm

If the piston, guide rod, and/or cylinder is dirty with carbon build up, it won't slide when the bolt is locked to the rear.
When you clean the gun, it will start sliding again.

If the piston doesn't slide with the bolt locked back, you need to clean your damn gun!!!!
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