Quantcast
  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

AR-15 flash suppressor tightenin

Discussion in 'Rifle Country' started by Dan Forrester, Jul 21, 2007.

Thread Status:
Not open for further replies.
  1. Dan Forrester

    Dan Forrester Member

    Joined:
    Mar 21, 2003
    Messages:
    659
    Location:
    FL
    I picked up a matching LMT upper for my lower I purchased a couple months back and have a question about the flash suppressor. Before I fire any new gun I like to take it completely apart and clean before firing. Part of this disassembly is removing the flash suppressor which was properly aligned with the vents point up to counter act the muzzle clime. It was thought to get off with a crescent wrench due to the crush washer (I believe that’s the what they call them). Now I can’t get it back on the muzzle tight enough for it to realign.

    What do I need to do?

    Thanks, Dan
     
  2. blackhawk2000

    blackhawk2000 member

    Joined:
    Mar 25, 2003
    Messages:
    851
    Location:
    Mi
    New crush washer maybe? Use a real wrench made to fit the FH properly, you'll be able to torque it down better. Crescent wrenches are garbage.
     
  3. W.E.G.

    W.E.G. Member

    Joined:
    Sep 26, 2006
    Messages:
    7,362
    Location:
    all over Virginia
    How are you securing the barrel while you are wrenching?
     
  4. Dan Forrester

    Dan Forrester Member

    Joined:
    Mar 21, 2003
    Messages:
    659
    Location:
    FL
    That’s the problem, securing the barrel. How is one supposed to do this?

    Also what’s the proper wrench?

    Thanks for the responses guys.

    Dan
     
  5. Telperion

    Telperion Member

    Joined:
    Mar 23, 2003
    Messages:
    1,482
    Location:
    Oregon
    Ideally, you want to put the barrel in a vise, use a GI M16 combo wrench or similar tool, and torque the flash suppressor to 15-20 ft-lbs. Don't overtighten, or you can end up constricting the bore.
     
  6. SigfanUSAF

    SigfanUSAF Member

    Joined:
    Aug 26, 2006
    Messages:
    982
    Location:
    North Carolina
    Any quality 3/4" wrench will work. Oh, and buy a new crush washer, they aren't designed to be reused.
     
  7. Dan Forrester

    Dan Forrester Member

    Joined:
    Mar 21, 2003
    Messages:
    659
    Location:
    FL
    Any links on where to pick up the barrel vise and fresh crush washers. Are there any other washer options available? Is that armorer’s (I know that’s spelt wrong) wrench considered the correct wrench?

    Thanks, Dan
     
  8. DMK

    DMK Member

    Joined:
    Dec 24, 2002
    Messages:
    8,763
    Location:
    Over the hills and far, far away
    You don't need a barrel vice. It's only 15 ft lbs. Get two pieces of soft pine, clamp the barrel between them in a regular vice. Tighten it just enough that it won't turn, don't go trying to crush it.

    You can get the crush washers from anyone who sells AR parts:

    www.adcofirearms.com
    www.brownells.com
    www.midwayusa.com
    www.rbprecision.com

    Yes, Peel Washers. You don't want them. They are a big PITA.
     
  9. DougW

    DougW Member

    Joined:
    Mar 16, 2004
    Messages:
    2,057
    Location:
    North Texas
    Put the barrel in the vice, not the front sight! Use soft pine as DMK said, and crank away. I have removed and installed 5 or 6 FH's, and sometimes you have to crank down on the vice. I have a 4" MAC Tool vice that I use.
     
  10. sigman4rt

    sigman4rt Member

    Joined:
    Jan 11, 2004
    Messages:
    169
    Location:
    Maine
    According to AMU (Army Marksmanship Unit) specs, do not torque the flash hider. Get yourself some red Loctite and leave off the crush washer. Hand tighten the FH until properly timed, then allow to "set up" overnight. Torquing the FH onto the barrel stretches the barrel threads and screws up your barrel harmonics.
     
  11. blackhawk2000

    blackhawk2000 member

    Joined:
    Mar 25, 2003
    Messages:
    851
    Location:
    Mi
    A crescent wrench is junk because they can easily back off, and round off whatever you are working on.
    [​IMG]
     
Thread Status:
Not open for further replies.

Share This Page