1. Welcome to Oklahoma Shooters Association! Join today, registration is easy!

    You can register using your Google, Facebook, or Twitter account, just click here.

Permanent attachment

Discussion in 'NFA & Class III Discussion' started by Hump66, Aug 17, 2012.

  1. Hump66

    Hump66 Sharpshooter

    Messages:
    4,477
    Likes Received:
    8
    Joined:
    Mar 6, 2009
    Location:
    42
    Is silver soldering a BATFE approved method of attaching a flash hider? I couldn't find the legal references, search-fu is weak this early in the AM.
     
  2. 338Shooter

    338Shooter Sharpshooter

    Messages:
    17,342
    Likes Received:
    9
    Joined:
    Mar 12, 2008
    Location:
    Get off my lawn.
    Rating
    100%
    Yes it is.
     
  3. jakerz

    jakerz Sharpshooter

    Messages:
    2,525
    Likes Received:
    18
    Joined:
    May 26, 2011
    Location:
    Ada
    Rating
    100%
    I hope so, or my 14.5" is illegal.
     
  4. Hump66

    Hump66 Sharpshooter

    Messages:
    4,477
    Likes Received:
    8
    Joined:
    Mar 6, 2009
    Location:
    42
    Did you do it yourself?
     
  5. jakerz

    jakerz Sharpshooter

    Messages:
    2,525
    Likes Received:
    18
    Joined:
    May 26, 2011
    Location:
    Ada
    Rating
    100%
    Negative. I had a local gunsmith do it for me.
     
  6. CAR-AR-M16

    CAR-AR-M16 Sharpshooter

    Messages:
    5,631
    Likes Received:
    131
    Joined:
    Sep 6, 2005
    Location:
    Duncan
    Rating
    100%
    According to the ATF NFA Handbook: Permanent methods of attachment include full-fusion gas or electric steel-seam welding, high-temperature (1100°F) silver soldering, or blind pinning with the pin head welded over.
     
  7. Hump66

    Hump66 Sharpshooter

    Messages:
    4,477
    Likes Received:
    8
    Joined:
    Mar 6, 2009
    Location:
    42
    Got my silver solder today. I'll be putting the barrel together in the next few days. I'll keep everyone posted and be sure to take/post pics.
     
  8. 338Shooter

    338Shooter Sharpshooter

    Messages:
    17,342
    Likes Received:
    9
    Joined:
    Mar 12, 2008
    Location:
    Get off my lawn.
    Rating
    100%
    Does putting 1100* on a barrel affect it?
     
  9. Shadowrider

    Shadowrider Sharpshooter

    Messages:
    17,899
    Likes Received:
    3,261
    Joined:
    Jan 28, 2008
    Location:
    Tornado Alley
    Rating
    100%
    It shouldn't bother it. To anneal 4140 which I'm guessing most mil spec barrels are made from (or something close to it) you have to go to about 1600°
     
  10. 338Shooter

    338Shooter Sharpshooter

    Messages:
    17,342
    Likes Received:
    9
    Joined:
    Mar 12, 2008
    Location:
    Get off my lawn.
    Rating
    100%
    I did some reading. IMO using a good 56% silver solder paste and some heat stopping paste is probably the best method. I've seen a few pin/welds fail easily.

    Working on a pretty elaborate thread protector for an ops inc 3rd model barrel profile all day. Probably have about 5 hours in it so far. Could reproduce it much faster but it has been a very interesting project so far. If I was going to produce it it would be two parts tigged together. 5" deep bore is not fun for me. I need a beefier boring bar. Started life as 304 round bar. Tubing would be the way to go welding the threaded piece in the end.
     

Share This Page