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Old November 21, 2012, 17:20   #1
def90
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AK-Builder AK74 5.45x39 barrel

Seeing that it seems to be impossible to find any information on US made AK barrels I thought I would post this here. I will update at the end of the project as well as list any issues noted to me via the builder.

For my 2 Bulgarian kits I decided on using the barrels that AK-Builder sells. From what I can tell online depending on what you read these are either Green Mountain blanks or Montana Rifleman blanks and the external contour is finished by Curtis at AK-Builder.

From AK-Builder website:
"These barrels are made from 4140 rifle blanks with a .214" bore and 1-8 twist. Each barrel is stamped USA 5.45 for 922r compliance.

The gas port is drilled, handguard retainer is cut and extractor clearance is cut on the chamber end."


From my 2 samples the gas port was not drilled, it is started but does not go all the way through to the bore which is probably a good thing as some gas blocks are 90 degree and some are 45 degree. I did not get a chrome lined barrel, they were back ordered and I did not want to wait for them and I am not sold that a barrel needs to be chrome lined anyway. The machine work looks nice and clean.

Crown looks good but I am contemplating having a target crown put on while they are blank just for the hell of it, what could it hurt? Thoughts on this from the peanut gallery?

Barrel diameter measurements with calipers are:

Trunion = 22mm, Rear sight block = 17.52mm, Gas Block = 15.05, and front sight = 14.55.

I plan on parking these this weekend and then sending them out with my parts to have them populated and headspaced.





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Old November 21, 2012, 23:08   #2
cbr954fz1
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thought about doing acouple myself but i'm waiting to see how yours come out... please keep us updated..cbr
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Old December 08, 2012, 12:58   #3
def90
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Had 11 degree target crowns pt on the barrels this week.

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Old December 11, 2012, 15:26   #4
littlematt
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very cool. i can't wait to hear how they shoot
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Old December 14, 2012, 02:22   #5
MajHenryWest
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Question Question

What does it mean to have a barrel "populated"?
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Old December 14, 2012, 03:03   #6
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Barreling the trunion and setting headspace, basic set up of an new barrel for an AK.
I hope this is right.

I have heard of Copulated barrels, Hehe.

With some tuned ammo that AK should really perform.
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Old December 15, 2012, 00:10   #7
def90
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Quote:
Originally Posted by MajHenryWest View Post
What does it mean to have a barrel "populated"?

Taking all of the components such as front sight block, gas block and rear sight block and installing them onto a virgin barrel.
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