How to permanantly attach flash hider?

Discussion in 'How to' started by ChipM, Dec 19, 2010.

  1. ChipM

    ChipM Active Member

    2,284
    0
    36
    I'm interested in switching a 16" AR carbine into a 14.5" carbine. Since my 16" carbine is essentially a 14.5" carbine with an extra 1.5" on the end of the barrel, I'm thinking that cutting the barrel is an easy way to accomplish this goal.

    Can I simply tack weld a flash hider onto a sub-16" barrel in order to satisfy NFA requirements? Is there a way that I can cut down a rifle barrel (separate from the lower) and then weld the flash hider on without being in possession of an SBR during the construction process (i.e, after I cut the barrel but before I weld on the flash hider)?
     
  2. Fallschirmjäger

    Fallschirmjäger I watch the watchers

    12,835
    62
    48
    http://www.atf.gov/publications/downloa ... pter-2.pdf

    Per the BATFE "...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..." Tack welding is not permanent enough in the ATF's opinion.

    If the lower is separated from the upper (or the barrel is separated from the serial numbered part, then it's not a SBR until you are in possession of both. The safest ways are to do the paperwork before doing any cutting or welding, or, to have the barrel someplace where the receiver is NOT. I always used my brother's house as my 'out of my possession' spot.
     

  3. ChipM

    ChipM Active Member

    2,284
    0
    36
    Great link to the ATF publication - thanks! Is there any specification for what must be used as a blind pin? Can I assume 1/16" steel rod would suffice?
     
  4. 1clearshot

    1clearshot Member

    839
    0
    16
    Don't you have to re-crown the barrel at muzzle end after you cut the barrel? (Assume you already know this)

    Edit to add: If you have chrome-lined barrel, doesn't it hurt the chrome finish? I'm just asking....I don't know what tool, process is used to cut a barrel....
     
  5. ChipM

    ChipM Active Member

    2,284
    0
    36
    Yes, you have to recrown. I don't believe it will harm a good chome lining.
     
  6. ChipM

    ChipM Active Member

    2,284
    0
    36
    How is soldering done in this case? By flowing it into the threads, like on a plumbing fixture?
     
  7. Fallschirmjäger

    Fallschirmjäger I watch the watchers

    12,835
    62
    48
    yep. Just remember....no cheap stuff 8) gotta be high-temp (and the ATF is rumored to have some gorilla's in their employ). Personally, I'd think the chance of anyone getting their drawers in a twist is pretty slim, though.