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Posted: 3/17/2011 5:37:14 PM EDT
| Can threads (muzzle) on an AR barrel be repaired? |
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What's wrong with them? The answer to your question is "yes", but that comes with lots of caveats without more information. Yup- if it is minor damage you can "Chase" them or clean them up with a thread file. If they are badly damaged you can turn down the threaded portion to about 3/8ths and make a bushing that you silver solder on, then turn and thread it. |
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you could buy the die and run it over the threads. Run a die over them and you will end up with undersized threads. How so? Common off the shelf dies are made for typically a class 2A fit, general loose tolerance threads acceptable for general use i.e. bicycles and lawnmowers. I personally don't feel that is acceptable for a firearm. When I turn and thread I shoot for a tight 2A to 3A thread fitment. When you run a die down a piece of round, virgin material the cutting edges of the die experience substantial loading which causes a certain amount of "spring" to them. As a result your threads are close to a 2A fit. This is by design. When the die is removed it relaxes somewhat and the cutting edges spring back. It is only a very small amount, maybe a thou or so but it is there. Now when you run the same die over a part that is already threaded the likely is high that the threads will be a smidge undersize, nearing a 1A fit (sloppy). You can counter that effect with an adjustable die somewhat but you almost need to measure what the major/minor diameters. I may be overthinking it a bit but I did have to rework 100 parts in a shop once on my time and material because I tried to cheat a bit and used a die instead of singlepointing the threads like the boss had told me to do, the threads ended up out of spec and I ate the parts. I guess it is your call-if all you are going to run is a flashhider on the rifle a smidge under probably will cause no issues. But if you are going to be running a brake or a can then you want that threading as precise and close fitting as possible. FWIW the difference between classes of fit on a 1/2" thread is only .0015 or one and one half thousandths. |
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