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Thread: I messed up a Colt 14.5" barrel while drilling it for an extended FH

  1. #31
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    Quote Originally Posted by logan09 View Post
    I don't think he wants to sell it for $50, but If he does, I'm pretty sure I'm first in line
    $51.

  2. #32
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    Quote Originally Posted by Peanut View Post
    Alex V,

    Do you know who said this and did they give a reason why.
    I'm always looking to expand my data base.

    TIA
    Not an explination, more of a blanket statement so not sure how much help it will provide.

    Quote Originally Posted by decodeddiesel View Post
    DO NOT LET YOUR FRIEND WELD THIS UNLESS YOU ARE ABSOLUTELY SURE YOU AND HE KNOW WHAT YOU ARE DOING!!!

    If he tries to draw a bead all the way around the muzzle device then yes he will absolutely ruin the barrel.

    All you are doing is drilling through the muzzle device (already done on the BC) threading it onto the barrel, and torquing to spec, then just barely drilling through the hole and into the threads...I emphasize just barely as it is damn easy to drill all the way through the threads and into the bore which will ruin the barrel.

    You then make a pin that is the same diameter as the holes, fit it so it is the same depth as the over all hole, and spot weld over the top of it. It's really quite easy and anyone with a rudimentary knowledge of welding should be able to do it.



    I have used a MIG welder for this as well as a TIG and it worked just fine. You are right though, it is a 1-1.5 second weld.

    Also, seems like some are saying it will be fine, but others the opposite, so take the above with a grain of salt I suppose.

    As for me, I would be in the camp of those who say get another bbl and use this guy for a SPR project down the road. There is no way in my limited oppinion that a .125" or so hole [I assume you used roughly a 1/8" drill bit] so close to the crown of the barrel will not adversly effect the accuracy of the bbl. As the projectile passes that are, there will surely be a void there, causing gas pressure to drop on that side of the round, would that not induce yaw? I mean there maybe what, .5" or .625" left after it passes the newly made hole and before the bullet is in free air. I would imagie this causing yaw. But then again, I am as noob as noob gets when it comes to the firearms world, though I do try and read as much as I can on here.

  3. #33
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    Quote Originally Posted by Alex V View Post
    Not an explination, more of a blanket statement so not sure how much help it will provide.




    Also, seems like some are saying it will be fine, but others the opposite, so take the above with a grain of salt I suppose.

    As for me, I would be in the camp of those who say get another bbl and use this guy for a SPR project down the road. There is no way in my limited oppinion that a .125" or so hole [I assume you used roughly a 1/8" drill bit] so close to the crown of the barrel will not adversly effect the accuracy of the bbl. As the projectile passes that are, there will surely be a void there, causing gas pressure to drop on that side of the round, would that not induce yaw? I mean there maybe what, .5" or .625" left after it passes the newly made hole and before the bullet is in free air. I would imagie this causing yaw. But then again, I am as noob as noob gets when it comes to the firearms world, though I do try and read as much as I can on here.
    99.99% of AR's have a gas port hole drilled as well

  4. #34
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    shoot it, see what happens. i predict it will either immediate keyhole, or begin to keyhole within a couple thousand rounds

    if it was me, i'd put it in the cabinet and wait for the next SBR project. the muzzle is no place for damage

  5. #35
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    Quote Originally Posted by mike_556 View Post
    99.99% of AR's have a gas port hole drilled as well
    Yes, but it is further from the cown and once again, only a guess, but if the OP intended to use 1/8" pin that makes the are of the gas port 1/4 that of the are of the inadvertant hole the OP made.

    Once again, only a conclusion based on oppinion, but going from a .003117 SqIn hole roughly in the middle of a barrel to a .012272 SqIn hole very close to the crown would cause a problem in accuracy.

    Just an oppinion tho.

  6. #36
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    Quote Originally Posted by bkb0000 View Post
    shoot it, see what happens. i predict it will either immediate keyhole, or begin to keyhole within a couple thousand rounds

    if it was me, i'd put it in the cabinet and wait for the next SBR project. the muzzle is no place for damage
    I would not even bother shooting it. The OP will spend time and possibly money having the muzzle device attached, only to have a BBL that keyholes. Cant re-use a pined/welded muzzle device after it is removed and some of them are by no means cheap... Why waste it? Just throwing more money away if the bbl turns out to be ruined.

  7. #37
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    Quote Originally Posted by Alex V View Post
    I would not even bother shooting it. The OP will spend time and possibly money having the muzzle device attached, only to have a BBL that keyholes. Cant re-use a pined/welded muzzle device after it is removed and some of them are by no means cheap... Why waste it? Just throwing more money away if the bbl turns out to be ruined.
    yea, that's the smart attitude, and why i said the "if it was me..." part. but since it's NOT me, i'd like to see what happens.

  8. #38
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    AlexV makes a good point. If I weld it and in a few hundred rounds accuracy starts to suffer (and we can logically assume that accuracy is effected even now with this so close to the muzzle) then where would I be? I'd have to sell it and get a fraction of my investment out of it or destroy the A2X FH and pay for barrel shortening/recrowning, plus the NFA stamp. What SBR lengths/muzzle attachments do you recommend that give good performance? Is there a significant velocity and accuracy difference between a 12.5" plus an A2 FH and an 11" and a Noveske pig? Maybe a 13.5" or 14" custom length and a Noveske pinned (by a pro this time) would be 16.1" loa? Do you think this barrel can be cut down and have a FSC556 attached and still be 16.1"?
    Last edited by Davy35D; 08-20-10 at 17:42.

  9. #39
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    if it's a factory colt, your thread shelf should be wide enough to simply turn the barrel back 3/8ths-1/2"

    if this is the case, you could do that, and then perm an extra long muzzle device. i would not do a KX3- they're heavy and wasted on non-CQBRs. i think the levangs are pretty long, and there's others.

    ADCO will turn it back for $75. tell them not to turn down the shelf behind the threads, and not to **** with the gas port, though.

  10. #40
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    Why does this always happen to COLT barrels?

    This isn't the first time someone who has no business working on firearms has made this mistake. I've read of this at least 2 other times on ARFcom.

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