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391 gas system installation

Discussion in 'Shooting Related Threads' started by mono1393, Mar 5, 2011.

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  1. mono1393

    mono1393 Member

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    I was cleaning the piston and piston bore today. I took the spring and guide off to clean the gas valve assy. When replacing the exhaust valve assembly, I notice that it had a sort of hood on the guide inside the cylinder. Does this hood inside the gas cylinder cover the barrel ports, or should it be turned so it is on the under side allowing gasses to come into the gas valve assy unabated. Does anyone know what I am talking about? Any help would be appreciated.

    Chris Morris
     
  2. Mark425

    Mark425 TS Member

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    Its the 1st way you described, covers the barrel ports.
     
  3. 635 G

    635 G Well-Known Member

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    There is a great tutorial on cleaning a 391 on shotgunworld.

    Phil Berkowitz
     
  4. mono1393

    mono1393 Member

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    Thanks for the help. Does anyone know what happens if you install the guide the other way or is it not possible?
     
  5. Tron

    Tron Supporting Vendor Banned Supporting Vendor

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    Yes, you can install the guide 180 degrees off and it will usually still function fine. The hood faces upwards toward the barrel and deflects the gas pressure evenly.
     
  6. dmdegood

    dmdegood TS Member

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    Dec 27, 2010
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    The shotgunworld post was by Seamus O'Caiside on 2/26/2007 titled
    Disassembly of Beretta 391. Seamus has published a book on this
    topic which is a must have for all 391 owners. The post outlining
    ordering information is dated 11/5/2007, and is available for $20.00.
     
  7. mono1393

    mono1393 Member

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    Thanks again fellas.
     
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