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Posted: 1/20/2009 11:26:28 AM EDT
I have a mak-90 that I want to thread the barrel on. Here is a crappy picture.
The tip of the barrel is about .5 inches to the unturned portion of barrel that holds the front sight. The width of the barrel is .55 inches. Plan on using this kit to thread my barrel. I am buying a kit because I don't want to pay a gunsmith and may thread other barrels in the future. I am going to use a YHM flash hider to work with my 7.62 phantom. In order to thread this barrel, should I remove the front sight? Thanks. |
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Dang, so which is it?
Sorry the pic is so crappy. I can see the tool marks that look like ultra fine threads. They are along most of the barrel and there are un-turned down parts where the gas block and front sight are. I talked to my uncle who has machining experience and threading stuff. Given that 14mm = 0.551181102 inches it seems that it ought to be just enough to thread to 14mm. Too bad I just bought a 1/2"x28 to M14x1LH adapter from TROS. Anyone need something like that? ETA: We're talking tousandths of an inch here, how big a deal is it? |
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Quoted:
.55 has NOT been turned down. It's perfect to thread 14x1LH. You need to read a bit closer, I think. It appears the muzzle is turned down to .50 according to the OP. The .55 is farther down the barrel under the FSB. I've threaded barrel 14x1LH when they were about .52 but .50 is going to need to be threaded for the AR size threads. I always remove the FSB when threading but I am usually replacing the FSB and gas block at the same time. It doesn't matter what the thickness of barrel under FSB is, the threads are going forward of the FSB unless you are cutting the barrel back. OP, what is the exact measurement at the muzzle to the FSB? |
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I had the same issue with a Mak90 and threaded the muzzle 1/2x28RH and if I remember correctly, without removing the FSB. I installed an AR flash hider with a crush washer, but I think they make AK style slant brakes and others at 1/2x28RH so you can engage the detent pin, or I guess you could notch for it.
The TAT is a must. I think I bought it from Precise and the die/handle from Victor Machine. Just make sure you ream out the hole for 7.62 if the brake is meant for the AR.....I'm sure you knew that but can't hurt to mention it. Good luck. |
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You can thread it without removing the FSB, just thread it as far as possible, then turn the die around so that the recess of the die is on the other side and it will allow you to thread the barrel down farther. You may still need to "hog out" the muzzle attachment a little so that it will screw all the way down to the FSB. By "hog out" I mean that you chamfer the edge of the muzzle attachment. When installed the chamfer will not be visible. If needed, I have pictures to post.
ARKAR |
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Quoted:
Quoted:
.55 has NOT been turned down. It's perfect to thread 14x1LH. You need to read a bit closer, I think. It appears the muzzle is turned down to .50 according to the OP. The .55 is farther down the barrel under the FSB. I've threaded barrel 14x1LH when they were about .52 but .50 is going to need to be threaded for the AR size threads. I always remove the FSB when threading but I am usually replacing the FSB and gas block at the same time. It doesn't matter what the thickness of barrel under FSB is, the threads are going forward of the FSB unless you are cutting the barrel back. OP, what is the exact measurement at the muzzle to the FSB? Sorry, I reread this thread and what I posted, and yes, .55" is just right, but .50" is too small and does need 1/2-28 threads. I meant to type ".50" is too small". You can just look at the picture and see that it has been turned down. |
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OP, what is the exact measurement at the muzzle to the FSB?
about .55 ETA: I am going to go check it again right fast. Yah, it is .55 inches and if I change it over to mm it says 13.9. If I had the cable for my camera I would upload a better picture, but I left it at my GF's house. I went ahead and bout the 14x1LH tap kit and yhm flash hider to go with it. |
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About isn't going to do it, you need the exact measurement with a caliper as we are talking millimeters in difference in diameter of the muzzle. You have about 3 mm to work with whether you go 14x1LH or use the right hand AR size thread. 14x1LH gives you the normal thread size for 7.62x39 devices.
.50 is not enough meat for the die ,.51 will not give you deep enough threads, .52 has worked for me. I've never seen a MAK-90, SAR-1, or any I can remember with a .55 diameter unless the Chinese with heavy barrels had them. |
| Yup. Have you ever threaded one? Use plenty of threading/cutting oil. Lock it in a vice and thread no more than a 1/4 turn and then keep backing it up a bit to cut the chips and clear them out of the die. Make sure you have a TAT and that the threads are cutting correctly and not crooked.http://home.comcast.net/~jfreeman16/Threading_AK_rifle_barrels.htm |
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It took some time to get the thread kit in but it finally showed up.
Threading it was quite simple with the instructions provided by Mak. Thanks for those. The whole process is a lot simpler than it seems and doing the research and asking questions make everything go smooth. Here is a pic of the gun as it is now: 
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| Your welcome. It isn't hard but you have some members here that think it is rocket science that only AK gurus should tackle and seem to think it will ruin the value of any gun it is done to. Most likely the same guys that have to send their guns off to have a part changed out. |
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