Flash hider permanently attached,

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  • ABN_INF

    Well-Known Member
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    Sep 3, 2012
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    belle chasse
    Can anyone recommend a local gunsmith (New Orleans) surrounding areas who can do this. I was talking to a guy in harahan but he seems pretty busy and I'd like to get it done ASAP so I can finish this build.
     

    Ritten

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    I don't do them anymore because of the headache, I couldn't stand to see a barrel ruined like that, and it costs nearly the same to go buy a new barrel that's already 16" or just do an SBR.
     

    ABN_INF

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    Sep 3, 2012
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    belle chasse
    Really? Adco does it for $30 if I can't find someone local I'm gonna send it to them...I'm no machinist, but what's so hard about it?
     

    Akajun

    Go away,Batin...
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    Apr 10, 2008
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    Brusly
    If you're looking for a $30 threading job, then nothing hard about it and you're right...you can do it yourself pretty easily. A hack saw, a hand drill, a 1/2x28tpi die, some high temp solder and a torch ought to fix it right up. Good luck!
    don't forget an angle grinder to dress down the burrs from threading, remember you want this to be professional looking
     

    GunRelated

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    Feb 22, 2012
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    Walker, La
    I think you guys are misunderstanding he has a threaded 14.5" barrel and simply needs a muzzle device pinned or silver soldered on.

    Correct. I have gotten quotes from local guys as well for this and was surprised at price I was quoted. Seems like a quick, simple job if you have the right tools. Maybe I am missing something?:confused:
     

    Ritten

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    Correct. I have gotten quotes from local guys as well for this and was surprised at price I was quoted. Seems like a quick, simple job if you have the right tools. Maybe I am missing something?:confused:

    To do it right as per the ATF, the flash hider has to either be welded on or pinned and then hi-temp soldered on. It has to be secured to the point in that the barrel would be destroyed in the process of removing the flash hider. So, either you have the CROWN of your barrel heated up to the point of changing the metal stresses (or worse) at the most important part of the barrel...OR you are drilling a hole past the threads, inserting a steel pin, and then heating up the barrel to the point of changing it's stresses but now it has a VERY thin weak point. It takes 15min of direct heat from a propane torch to heat up a barrel enough to melt 1100 degree silver solder ($50 a roll mind you). MAPP will get it faster, but you can really get it too hot easily. Not to mention that all of this WILL destroy any coating you have on it. It can't be welded in place with a crush washer and it's not really a good idea to have shims in the weld either, so if going with a weld then the FH has to be timed to start out with. That takes a lathe and about an hour of shop time on a good day.

    It's a pain in the ass for an inch and a half.
     
    Last edited:

    GunRelated

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    If that is truly the case, I wonder why so many people run 14.5" barrels with pinned FH's? I wonder I companies like BCM offer 14.5" assemblies with pinned FH's but don't mention anything about compromising the barrel?
     

    SpeedRacer

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    Mandeville, LA
    Ritten is technically correct, although he has a "precision" mindset and builds works of art that are measured in 1/100th MOA. For normal use on regular ARs it's just fine. My DD is a 14.5" barrel with pinned FH (with crush washer) and it's just as accurate as my 16" BCM.
     

    GunRelated

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    The way I understood it, as long as the FH is pinned, it doesn't need to be welded. What is the consensus on this? If this is true, then pinning a FH should be a very quick and easy job with the correct tools which is why I can see how Adco can do the job for $30 all day long.
     

    SpeedRacer

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    Feb 23, 2007
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    The way I understood it, as long as the FH is pinned, it doesn't need to be welded. What is the consensus on this? If this is true, then pinning a FH should be a very quick and easy job with the correct tools which is why I can see how Adco can do the job for $30 all day long.

    You have to blind pin it and weld over the hole.

    Here's mine after welding before coating.

    u2a6e3ep.jpg
     

    GunRelated

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    Feb 22, 2012
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    You have to blind pin it and weld over the hole.

    Here's mine after welding before coating.

    u2a6e3ep.jpg

    Yes, that is the way I understood it. The way Ritten explains the method, it requires pinning, then welding where the FH meets the barrel after being installed.
     

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