View Full Version : barrel threading kit & muzzle brakes
I ran into a company in Idaho that produces a bore alignment and barrel threading kit for a number of AK & variant weapons....
As I understand it, if the barrel diameter is not on their list, they can still help.....they just need to know the barrel diameter...(like Saiga's for example).
Here's the link: http://dynasystems-ltd.com/GunFile/Products.html
read the how to on barrel threading.
I haven't ordered a kit yet but will shortly and report.
12-18-2003, 10:02 PM
You can order a metric threading die, 10mm x 1tpmm lefthand, for the AK, or 15mm x 1 tpmm righthand for the AK-74. Since BATFE dosn't know of a flash suppressor threaded for the AL-74, it may be threaded legally. The same is true of other threads, except for the 1/2 x 28 on the AR and the FAL thread.
What I liked about what they offered which I have not seen available anywhere else (although it might be) is the integral bore guide centering device they use and the split nut adjustable die nut.
I had thought about threading before but the idea of possibly getting off center was a thought preventing me from trying it.
They seemed to have solved two problems.....centering the threads and allowing the thread to be adjusted to get a slight interference fit to the muzzle brake. Both very important items which for the average do it at home guy (like me), would be otherwise impossible.
Were drugs involved when you posted the thread sizes of AK rifles?:confused:
The correct size threads on AK-47/AKM rifles is 14x1mmLH. There are flash suppressors/granade launcher attachments made this size so a muzzle brake has to be permantly attached. The Romanian AK-74 has 22x1.5mm threads. There are not any flash suppressors made threaded this size so the BATFE doesn't count barrels as being threaded in this size. The Russian and other countires AK-74 rifle's barrels are threaded 24x1.5mm. There are flash suppressors threaded this size so a barrel threaded this size a muzzle brake has to be permantly attached.
On post ban AK rifles I have run into many rifles that have unthreaded barrels. If the barrel is 14mm/.551" a 14x1mmLH die can be used. On rifles that have had the 14x1mmLH threads turned off such as the rifles imported from Romania the barrels are 12.9mm/.508" in diameter and can be threaded using a 1/2x28 die which is the standard size for M-16/AR-15 barrel threads. AK-74 style and many other styles of muzzle brakes are made with 1/2x28 threads. If a barrel is threaded 1/2x28 the muzzle brake has to be permanetly attached because there are flash suppressors/granade launchers made for this size threaded barrels.
I have threaded the barrels on many AK rifles with threading kits from Dyna Systems and they work very well. Make sure to specify the bore diameter(7.62mm,5.56mm,5.45mm) so you get the right size thread alignment tool and barrel diameter so you get the right size die when ordering.
Remember that if you thread a AK rifles barrel 24x1.5mm,14x1mmLH,or 1/2x28 the muzzle brake has to be permanetly attached by the methods mentioned in this BATF letter.
03-03-2004, 02:55 PM
On post ban AK rifles I have run into many rifles that have unthreaded barrels. If the barrel is 14mm/.551" a 14x1mmLH die can be used. On rifles that have had the 14x1mmLH threads turned off such as the rifles imported from Romania the barrels are 12.9mm/.508" in diameter and can be threaded using a 1/2x28 die which is the standard size for M-16/AR-15 barrel threads. AK-74 style and many other styles of muzzle brakes are made with 1/2x28 threads.
This is good info to know, but do you know of any tolerances? My Romanian WASR-10 came unthreaded and the barrel diameter is 0.549 at the barrel tip and 0.550 at the front of the sight base. I would like to install the AK74 style brake with the 14x1 LH thread as they are easy to come by and they look great. Is there enough material there to cut the 14mm threads or do you have to go with the 1/2x28? I would like to find a threading kit also if someone has one for sale otherwise I will purchase one from dynasystems as they seem to be the only ones who advertise them.
03-05-2004, 08:49 AM
I recently had success using a 1/2 x 28 die, with a 5.56 TAT on a 7.62 barrel. I carefully applied an even band of electrical tape to the shaft of the TAT (approx. 6" long) I then cut off about 1/4" pieces with a razor until the TAT fit snuggly into the bore. The results were excellent.
03-10-2004, 08:38 PM
Sprout You have enough to thread it 14x1.My Sar 1 measured the same as yours and it worked great.
03-11-2004, 10:32 AM
I think he was mentioning non-standard threads in his post.
If The Russian and other countires AK-74 rifle's barrels are threaded 24x1.5mm. There are flash suppressors threaded this size so a barrel threaded this size a muzzle brake has to be permantly attached.
is true, then a 15mm x 1 tpmm righthand would not need to be attatched permanently....
03-06-2009, 11:11 PM
bump, so i dont have to dig for it later :P
.549 looks like im goin 14x1L if i can find a kit to rent for a reasonable price.
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