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Old 03-15-2017, 05:11 PM   #1
OCRebote78
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Default Coming out! (sort of speak)

Well, been lurking for a while now and finally decided to "come out".

After many hours of video watching as well as picking other members brains (whom by the way have been more than gracious in replying), after acquiring a couple of parts kits (Polish AKM & Bulgarian AK74) and finally being able to acquire the majority of the tooling necessary to assist me in this labor of love. I finally built up the courage to try my hand at building my own AK(s).

Granted, I have minimal experience with drilling and or metal work, but I do have a lot of confidence in myself.

Anyhow, I figured I'd introduce myself and hope to learn as much from this community as possible.

I've attached a couple pics of my AK74 and which I've started to demill.
Also, once I removed the barrel from the trunnion, I noticed surface rust?
Not sure if this is something I need to be concerned about prior to installing a new barrel.

Thank you in advance for your time.



Surface rust?
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Old 03-15-2017, 05:27 PM   #2
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i wouldnt worry, its not important. maybe spray some wd40 in it before installing barrel and rivets.
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Old 03-15-2017, 06:58 PM   #3
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Kroil/regular oil and some fine grit (220-300) sand paper and clean er up.
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Old 03-15-2017, 07:26 PM   #4
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Quote:
Originally Posted by timhogan427 View Post
i wouldnt worry, its not important. maybe spray some wd40 in it before installing barrel and rivets.
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Originally Posted by akenthusiast1 View Post
Kroil/regular oil and some fine grit (220-300) sand paper and clean er up.
Would dunking it in vinegar over night do the trick? Hate to leave any traces of rust after installing new barrel. Would kill me for years to come just thinking of the rust eating away over time. lol. Paranoid I suppose.
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Old 03-15-2017, 07:39 PM   #5
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I'd do that, or toss it in a jar of evaporust. I had a 74 trunnion riveted into a receiver that rusted after I forgot about it for a while-- soaked it in evaporust and it looked good as new
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Old 03-16-2017, 05:44 AM   #6
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they sell vinegar that is made for cleaning. its 1% stronger i think. a soak overnight would fix it. or you can accelerate it by heating the vinegar in a stainless sauce pan on the stove. hot acid reacts faster
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Old 03-16-2017, 11:37 AM   #7
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they sell vinegar that is made for cleaning. its 1% stronger i think. a soak overnight would fix it. or you can accelerate it by heating the vinegar in a stainless sauce pan on the stove. hot acid reacts faster
Thanks a lot. I'll make sure to look out for it. Would I find that at grocery store or maybe hardware store?

Our vinegar at home was just gonna go "missing". But rather buy stuff made for removing rust.

thanx again.
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Old 03-17-2017, 02:07 PM   #8
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So I completely demilled the front trunnion. I want to say that the egging on that far hole
was already like that, but I may or may not have done it. Any issues you guys see when it comes time to rivet?

Also, I'm looking into purchasing the barrel for it from different vendors. But in doing some research, looks like I have to make sure the barrel journal is a hair larger than my trunnion inside diameter. I used some cheap digital calipers to measure and after many attempts at getting a consistent number, I ended up with .868. Now I'm not sure how much pressure I needed to put on the calipers to get a good number but I was turning the dial with some pressure and the letting go.

That being said, what is a good barrel journal dimension for my trunnion?

Thanx again.

[IMG][/IMG]
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Old 03-17-2017, 05:27 PM   #9
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Buellster is also in our akfiles
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Old 03-17-2017, 06:04 PM   #10
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Buellster is also in our akfiles
Just a hard man to get a hold of. I'll keep trying though.
Thanx.
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Old 03-17-2017, 06:09 PM   #11
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Quote:
Originally Posted by OCRebote78 View Post
So I completely demilled the front trunnion. I want to say that the egging on that far hole
was already like that, but I may or may not have done it. Any issues you guys see when it comes time to rivet?

Also, I'm looking into purchasing the barrel for it from different vendors. But in doing some research, looks like I have to make sure the barrel journal is a hair larger than my trunnion inside diameter. I used some cheap digital calipers to measure and after many attempts at getting a consistent number, I ended up with .868. Now I'm not sure how much pressure I needed to put on the calipers to get a good number but I was turning the dial with some pressure and the letting go.

That being said, what is a good barrel journal dimension for my trunnion?

Thanx again.

[IMG][/IMG]
The egging I see on the far rivet hole looks minimal and won't be an issue once the rivet is smashed properly and fills the void.
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Old 03-17-2017, 06:46 PM   #12
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Originally Posted by Porsche914ls6 View Post
The egging I see on the far rivet hole looks minimal and won't be an issue once the rivet is smashed properly and fills the void.
Thanks for the peace of mind. Appreciated.
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Old 03-17-2017, 09:25 PM   #13
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Evaporust is magic. Should be easy to find at any auto parts store. A quick coat of Eezox after should prevent any recurrence.

ETA: be aware evaporust will remove parkerizing/bluing.

Last edited by BuddyChryst; 03-17-2017 at 10:10 PM.
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Old 03-18-2017, 10:45 PM   #14
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Quote:
Originally Posted by BuddyChryst View Post
Evaporust is magic. Should be easy to find at any auto parts store. A quick coat of Eezox after should prevent any recurrence.

ETA: be aware evaporust will remove parkerizing/bluing.
Looks like the AK74 finish was spraid on. So I'm gonna assume I don't have to worry too much on that end?
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Old 03-19-2017, 07:38 AM   #15
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kroger sells the cleaning vinegar. i guess any grocery store.
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Old 03-19-2017, 08:31 PM   #16
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I'm having a hell of time trying to figure out what barrel will work for my 2 builds.

The following are my extensive measurements for both trunions:
(Including using telescoping gauges)

AKM Polish = .909
AK74 = .868 (granted, the trunion number on top reads #1)

Thanx in advance.
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Old 03-20-2017, 12:27 AM   #17
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Quote:
Originally Posted by OCRebote78 View Post
I'm having a hell of time trying to figure out what barrel will work for my 2 builds.

The following are my extensive measurements for both trunions:
(Including using telescoping gauges)

AKM Polish = .909
AK74 = .868 (granted, the trunion number on top reads #1)

Thanx in advance.
Polish FB Radom barrel for the AKM

Bulgy kvar barrel for the 74
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Old 03-21-2017, 12:48 AM   #18
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Quote:
Originally Posted by hellayella8888 View Post
Polish FB Radom barrel for the AKM

Bulgy kvar barrel for the 74
I think given my measurements, I'll need to go with oversized barrels for both.
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Old 03-21-2017, 01:06 AM   #19
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I have measured and threaded many Polish barrels and all measure .9087 plus or minus .0001 I do have one that is .909 exactly that I set aside.
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Old 03-21-2017, 01:10 AM   #20
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You need a barrel for a 74.. the polish barrel is for a 47.. it won't work. don't worry about journal size, you aren't going to ffind a vendor that is going to hand pick the right one for you never mind the fact that a hand caliper can't measure what you need accurately enough anyway. Either buy an original Bulgarian 74 barrel from KVar or get a 74 barrel from AK Builder.
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Old 03-21-2017, 01:21 AM   #21
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Quote:
Originally Posted by def90 View Post
You need a barrel for a 74.. the polish barrel is for a 47.. it won't work. don't worry about journal size, you aren't going to ffind a vendor that is going to hand pick the right one for you never mind the fact that a hand caliper can't measure what you need accurately enough anyway. Either buy an original Bulgarian 74 barrel from KVar or get a 74 barrel from AK Builder.
Wasn't planning on using a polish barrel on my 74. Each one it's own type of barrel. Also, if I can't get an accurate measurement from a caliper, than what can be used?

I've emailed Lonnie over at AK-Builder and he's got the oversized AK74
Barrel and was told he'd look for an oversized AK47 barrel. I guess what I'm looking for is reassurance that this is my only option given my trunions aren't standard size.

Lastly, after demilling the front trunion, I measured the cut-up barrel journal and it measured .869, which confirmed my trunion measuremen of .868.

Last edited by OCRebote78; 03-21-2017 at 01:30 AM.
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Old 03-21-2017, 01:29 AM   #22
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Quote:
Originally Posted by Obstreperous View Post
I have measured and threaded many Polish barrels and all measure .9087 plus or minus .0001 I do have one that is .909 exactly that I set aside.
Looks like I am the reason you set it aside. Lol.
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