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 Post subject: Re: Disassembly of Beretta 391
PostPosted: Sat Feb 02, 2019 7:54 pm 
Limited Edition

Joined: Thu Jul 05, 2007 9:44 am
Posts: 370
Location: Murfreesboro, TN
civil1977 wrote:
Yes, tighten the valve nut all the way down to compress the spring and then tighten the counter nut.


Thanks! I just completed it. I was only a half turn more to go after all. All clean and ready to shoot tomorrow :)



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 Post subject: Re: Disassembly of Beretta 391
PostPosted: Tue Dec 24, 2019 6:30 pm 
Field Grade

Joined: Sat Jan 31, 2009 8:46 pm
Posts: 88
Location: midwest
Hopefully this thread is still active. I have a SERIOUS problem. I purchased a used Beretta 20 ga Tekneys 391 from the for sale section here on ShotgunForum. The gun was advertised as nearly new. When I received it the gun, in fact, it looked barely used. The seller said he had set the gun up to shoot sporting clays and then changed gears.

From the get go when I took the gun to the range it failed to eject reliability and/or feed the shell from the magazine into the barrel. I took the gun apart and did the standard cleaning of items easily reached. Checked and cleaned the holes in barrel for the gas ejection. Lubed everything, reassembled and shot it again. Same problem(s). Reloads or new shells make no difference. Same problem.

I decided to take the gun apart even further. Disassembled the magazine tube into the component parts. Cleaned everything. Didn’t have a new spring so I couldn’t replace that. (I have since ordered one from Coles). I found something interesting in the magazine tube. Either the prior owner or someone before him had filled a fired 20 gauge hull with shot and placed it in the magazine tube in front of the spring next to the magazine cap ! I’m guessing it was done to add forward weight to the gun and provide a little forward balance (?). Regardless, I didn’t put the hull back in when I reassembled the gun. I also found someone had inscribed the capital letters BS on the side of the trigger group. One of my friends has speculated that the gun may have been worked on by Ballistic Specialties sometime in the past.

I put then gun back together and fired it. Same problem.

Next I took the stock off. I found someone had placed a Beretta brand recoil reducer in the stock. Didn’t know why that would really be necessary for a 20 ga. auto loading gun as I don’t feel the 20 ga exhibits excessive recoil. I found a replacement spring for the stock and installed that. Put the gun back together, oiled everything well and fired it. SAME PROBLEM !

Simply put, the gun won’t eject a shell whether there is only one shell loaded in the chamber or there is one in the chamber and one in the magazine. I’m at a loss as to what to check next ! Looking for some help in the way of suggestions to consider how to correct this problem. I like the gun and want to shoot it, but the way it is it’s simply not functional.


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 Post subject: Re: Disassembly of Beretta 391
PostPosted: Tue Dec 24, 2019 7:07 pm 
Crown Grade

Joined: Sat Mar 31, 2012 12:47 am
Posts: 3593
Location: Dallas, TX
Is the bolt going backward when the shell is fired? Or is it going back but the shell is getting jammed up in the chamber?

If you put 3 shells in the magazine tube and then eject them manually using the bolt handle will they all eject normally?

There are a lot of 391 experts on here so I'm sure someone will be able to help you.

Sounds like your 'new' gun came with a few extra goodies.


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 Post subject: Re: Disassembly of Beretta 391
PostPosted: Tue Dec 24, 2019 7:35 pm 
Field Grade

Joined: Sat Jan 31, 2009 8:46 pm
Posts: 88
Location: midwest
The bolt will come back, sometimes “all the way” and sometimes about 3/4 of the way but the shell does not eject. I’ve not tried loaded three shells and hand ejecting them. Can’t quite figure how to post a pic to show the position of the bolt once the shell is fired.

I have two other 391’s. Both are 12 gauge. I’ve disassembled both of them to compare how I’ve reassembled the 20 ga. and I don’t see that I’ve left any parts out nor assembled in the wrong way or backwards. This is driving me crazy. Makes me regret I sold my Remington 1100’s ! !

Because I’ve now taken this gun apart so many times and gotten overly frustrated having to use the “wrenches” supplied by Beretta I broke down and bought the socket made by Cole. That was better but even using a ratchet was a little tedious. Then I decided to couple the socket with an electric screwdriver and it’s simplified that part of the disassembling greatly.


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 Post subject: Re: Disassembly of Beretta 391
PostPosted: Tue Dec 24, 2019 7:43 pm 
Crown Grade

Joined: Thu Dec 05, 2013 7:11 am
Posts: 3634
Location: Western Tampa, FL
It sounds to me like you have done everything anybody could be expected to try. I think it is time for some professional help like Coles or some other Beretta specialist facility. I am not certain but Coles may now have a facility in San Antonio, TX at the shooting center. Good luck!


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 Post subject: Re: Disassembly of Beretta 391
PostPosted: Thu Feb 06, 2020 3:58 pm 
Field Grade

Joined: Sat Jan 31, 2009 8:46 pm
Posts: 88
Location: midwest
I wanted to provide a follow up to my post re: the Tekneys 391 failure to eject issue. After exhausting every remedy I could think of, read about, or was suggested on here I ended up sending the gun to Wally Reisebel in Missouri. He concluded the barrel porting was allowing too much gas to bleed off creating the ejection issue. He Informed me used a .19 drill bit and enlarged the gas ports in the barrel lug. The gun now cycles properly and ejects my standard 1,200 fps 7/8ths oz reloads.

For others who may be having this issue, a porter barrel may be the problem.


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 Post subject: Re: Disassembly of Beretta 391
PostPosted: Thu Feb 06, 2020 5:15 pm 
Crown Grade

Joined: Sat Mar 31, 2012 12:47 am
Posts: 3593
Location: Dallas, TX
Great info, thanks for sharing. Everyone just remember, you can drill out that hole and remove steel, but you can't put the steel back.




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