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Discussion Starter · #1 ·
So I recently started a custom AR15 build, and may have slightly compromised the thread on the front of the barrel, the thread for muzzle brake, I am unable to screw any muzzle or hider on the barrel? Its the first and second of thread from the tip of the barrel that is stripped. Please tell me there is a way to creatively solve this issue? Any suggestions or does anyone have experience dealing with this issue before?
 

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Discussion Starter · #2 ·
2730


Here s picture of the stripped thread at the tip of the barrel, it's only the very tip area that has been compromised so I. Really hoping that there is a solution to this situation that doesn't involve replacing the whole barrel...
 

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You could get a 1/2x29 and re-thread this. But it looks like your crown is not in very good shape. Or, it looks like it's in really bad shape. You do NOT need to replace the barrel. If you just can not find anyone to help you, I will. I've been treated more than fair from several forums. It would take longer to pack and ship than to fix this. Hopefully, you will find someone to help you closer than I am. [Tennessee] This is a simple fix and no one should charge much, if any, to repair it. RUN! If someone says you need a new barrel.
 

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Use a small 3 cornered file that fits the groove between threads. Remove misplaced metal, take your time. If the top is not flat use a flat file and be careful to only remove the high spot. A die nut could also be used if you can keep it straight. Lastly a dremmel can be used, just grind off offensive metal. You have plenty of clean threads and you could just grind the last couple off. You will want the small 3 cornered file to clean up the start of the threads regardless.
 

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Hi playdeadsarah, sound advice to use a 3 corner file to clean up threads. So how does one clean up the muzzle? Or else the rifles’ POI will never hit POA.

The easiest way is to take the barrel chunk it up in a lath and cut a clean bore exit in the muzzle.

If one doesn’t have a lath, one could use a vertical mill-drill, the only problem is locating accurately the barrel concentric with the bore-tool-mill/drill axis center.

Using a precision ground round to slip fit in bore, chucked in drill, indexes the drill. Next a bottom mill bit about 66% of barrel diameter, placed in drill chuck. Now machine a smooth sharp edge to the bore. Don’t need but a few thousands, or whatever it takes to clean it up.

There are many ways to make a mistake. And get the cut, off center. The best way is still to mount in a lath and do the same thing with everything mounted concentric. However if that’s all you got that’s all you got.
 

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Use a small 3 cornered file that fits the groove between threads. Remove misplaced metal, take your time. If the top is not flat use a flat file and be careful to only remove the high spot. A die nut could also be used if you can keep it straight. Lastly a dremmel can be used, just grind off offensive metal. You have plenty of clean threads and you could just grind the last couple off. You will want the small 3 cornered file to clean up the start of the threads regardless.
I couldnt agree more: A three angled file (any hardware store has them, about 8 bucks or so) will clean that right up. I have used one to clean up so many threads on so mant dif projects that I have buggered up, and it is truly a life, time and $$ saver. Ill add when you go to clean the threads up, try to use a magnifier glass of some kind to clearly see the angle of what you need to clean up. By looking at your pic, it MIGHT take a max of ten minutes of work and you'll be GTG
 
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