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Posted: 6/11/2011 11:57:51 AM EDT
| I have a Norinco Hunter, want to "Tabuk" it and make as few changes as possible. I know I have to switch out the trigger, 922, etc. I also want to thread the barrel. I know it will need the 1/2 X 28. My plumber friend asked is this "NPT" and if it is he will do it. Also, what does the "28" actually mean? Sorry for the dumb questions, but I sure don't want to screw this up! |
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½ -28 means –– ½ inch diameter and 28 threads per-inch which constitutes a “National Very Fine” thread…
NPT is a tapered pipe thread. For a ½ inch diameter its 14 threads per inch and “tapered” – and Oh God, don’t select that size for a whole bunch of reasons… Traditionally, AK muzzles are threaded w/ an M14x1 “left hand” die. M14x1 is a very fine thread. When it comes right down to it, that’s the one you should select. Conceivably, you could select a ½ -28, but I don’t think that it’s worth the aggravation… 
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Unless your plumber friend is "Gunplumber", run away fast! VERY FAST!! 
A 1/2 x 28 thread is a SAE machine thread. It means the threads are 1/2" OD and threads are spaced 28 TPI (Threads Per Inch). They are parallel (straight) threads. Like a bolt. NPT threads are tapered. You will need a 1/2" x 28 thread die and a 7.62 TAT (Thread Alignment Tool). You can probably find these at Brownell's or many other aftermarket suppliers. Dinzag may have them for rent. Be careful and go slow!! |
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Quoted:
THANK YOU BOTH! I am sure glad I asked. Iwas told I will need the 1/2 x28 as opposed to the x14 due to the barrel being cutdown due to AWB. I will pop on Danzig, thanjs again. And to be absolutely clear, it is not just a matter of replacing the fire control group. You convert it to a dark rifle you can't have mor than 10 imported parts (that usually adds up to 6 US parts). And those parts are not whatever part you want, they are very specific which parts count. Good luck and have fun!
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), pistol grip, muzzle device. This SHOULD make me okay? (Hoping to hear a yay or a nay.....)
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You "should" be 922 compliant with those parts.
You don't want more than 10 of the listed original imported parts. It's not about how many US parts you have, but how many imported parts remain. I recommend using a 922 worksheet like this one: http://thegunwiki.com/Gunwiki/BuildAkVerifyCompliance |
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Quoted:
I have a Norinco Hunter, want to "Tabuk" it and make as few changes as possible. I know I have to switch out the trigger, 922, etc. I also want to thread the barrel. I know it will need the 1/2 X 28. My plumber friend asked is this "NPT" and if it is he will do it. Also, what does the "28" actually mean? Sorry for the dumb questions, but I sure don't want to screw this up! Don't let him do it. Most likely he does not have the proper thread alignment tool for it especially if it is on 7.62. http://forum.saiga-12.com/index.php?/topic/66368-wts-barrel-threading-kit-14x1-lh/ |
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The problem is, if you start with 14mm thread, and then turn the threads off for import restrictions (vs tack welding a muzzle nut on), the resulting 13mm shank cannot be rethreaded to 14mm. It is too small. 13mm is close to 1/2" and there are a variety of 1/2" threads used in the gun business with 1/2x28 being most common. THere are also some manufacturers making AK type muzzle devices in 1/2" x 28 for just that reason.
You will also have to remove the front sight, since the threads go under the front sight by a turn. This allows the muzzle device to go all the way up to the front sight. An alternative is to counterbore your muzzle device by 2 threads. You can also get an adapter going from 1/2x28 to M24, and use an AK-74 device. Unfortunately, a 1/2x28 to M14x1 adapter is paper thin and not really practical. |
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