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  #1  
Old 12-04-2012, 10:07 AM
mr.22 mr.22 is offline
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Default Ak Barrel Pin Drilling?

Hey guys building first AK and need help.Drilling the barrel pin want to know what's the best way,easiest way,and cheapest way.Please give pics and links if possible.
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  #2  
Old 12-04-2012, 10:15 AM
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when I build mine I just pressed in the barrel, headspaced it, then stuck the trunnion on its side on my drill press and slowly drilled through the trunnion hole letting it self center. Used a fair amount of plain oil on the drill bit as I went. Got the correct size drill bit off ak builder.

my trunnion laid flat and at the correct right angle to the drill bit so I didn't have any issues.

some other builders may have a fancier way.
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  #3  
Old 12-04-2012, 10:28 AM
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If you're drilling a new barrel with a used trunnion I'd start with a flat end mill. The drill bit will want to wander when hitting the round surface of the barrel. The end mill will cut it flat then come in with the drill.
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  #4  
Old 12-04-2012, 10:58 AM
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I'm with Yari. Lose the drill bits for a Virgin barrel in a used trunnion.
1/4" flat bottom 4 flute end mill have from one side and half from the other.
Be sure to shim the trunnion (where the receiver would go) so it sits perfectly flat.
I use a drill press vice to hold the barreled trunnion.
Chase with 7mm reamer straight through.
Should look like a solid piece of metal when you look through the barrel pin hole (no steps).

should look like this

Last edited by nicoroshi; 12-04-2012 at 11:01 AM..
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  #5  
Old 12-04-2012, 11:23 AM
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I start with a good 3mm bit drilling from both sides until i can see a U shape.
then I slowly enlarge the U shape with dremel diamond bit, go real slow and again enlarge from both sides. Use 6mm drill bit to get rid of remaining metal crap,
finally finish up with the 7mm reamer.

Drill REAL slow, stop ofen to let things cool down, apply oil etc.
it may take longer than an hour to do it right.
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  #6  
Old 12-04-2012, 11:31 AM
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Use a sharp bit to start. I run a 1/4" to start, it depends on the barrel and trunnion. I have developed many ways to skin the kitty. I even have bushings that I've made to keep the bits centered but I find the easiest way is to just use a stubby 1/4" to get through.
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Old 12-04-2012, 2:53 PM
mr.22 mr.22 is offline
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Thanks alot guys very helpful.Hey quick question I read online can it be cut with hand files?
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  #8  
Old 12-04-2012, 3:16 PM
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Quote:
Originally Posted by mr.22 View Post
Thanks alot guys very helpful.Hey quick question I read online can it be cut with hand files?
I suppose but I guess you could clean a bathtub with a toothbrush too.
My fear would be filing on the trunnion as well as the barrel creating an enlarged barrel pin hole which is NOT good.

Headspace is a tolerance of .005"
That's really, really small.
It is responsible for the safe function of a firearm.

Do it right or don't do it at all if you value your health.
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  #9  
Old 12-04-2012, 4:30 PM
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I don't have a drill press or a milling machine.Does anyone know somewhere I could send it to have the barrel installed or would someone like to trade me a used barrel already done for my new virgin barrel?
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  #10  
Old 12-04-2012, 4:36 PM
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Quote:
Originally Posted by nicoroshi View Post
I'm with Yari. Lose the drill bits for a Virgin barrel in a used trunnion.
1/4" flat bottom 4 flute end mill have from one side and half from the other.
Be sure to shim the trunnion (where the receiver would go) so it sits perfectly flat.
I use a drill press vice to hold the barreled trunnion.
Chase with 7mm reamer straight through.
Should look like a solid piece of metal when you look through the barrel pin hole (no steps).

should look like this
Agree, this is how i drill mine. Except I use c-clamps instead of vice, comes out nice and the end mill bit cuts with ease.
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  #11  
Old 12-04-2012, 5:00 PM
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Quote:
Originally Posted by mr.22 View Post
Thanks alot guys very helpful.Hey quick question I read online can it be cut with hand files?
I start this way with a twist...

After head spacing I use a super sharp thin scribe to mark on the barrel through the existing holes in the trunnion, then push the barrel back out of the trunnion.

I then simply use a round file to get the pin hole recess groove close to the scribed lines on the barrel. Then I push the barrel back in the trunnion and re check head space and use the 7mm reamer to complete the process. It's an additional step, but it works and I've had no issues.

If I had a mill I wouldn't do this but using my drill press the bits wander all over.
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  #12  
Old 12-04-2012, 5:05 PM
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Thanks alot SVT-40 that really helps can't find anyone inline that will install it.Try the filing first.Thanks
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  #13  
Old 12-04-2012, 8:05 PM
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Quote:
Originally Posted by mr.22 View Post
I don't have a drill press or a milling machine.Does anyone know somewhere I could send it to have the barrel installed or would someone like to trade me a used barrel already done for my new virgin barrel?
Some of us here offer barrel services. The trunnion and bolt are needed to head space your barrel. You cannot just install any old used barrel into your trunnion and call it good. You might get lucky, but you might get your head blown off too. Is 50,000PSI 5 inches from your head something you really want to play around with?
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  #14  
Old 12-04-2012, 8:12 PM
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Quote:
Originally Posted by mr.22 View Post
Hey guys building first AK and need help.Drilling the barrel pin want to know what's the best way,easiest way,and cheapest way.Please give pics and links if possible.
Mr.22.........
I would seek out somebody local to you to assist with your population.
Im sure you could find somebody local willing to help you out.
What part of cal are you in?

Sent from my SCH-I510 using Tapatalk 2
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  #15  
Old 12-04-2012, 8:17 PM
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Quote:
Originally Posted by savagemann View Post
Mr.22.........
I would seek out somebody local to you to assist with your population.
Im sure you could find somebody local willing to help you out.
What part of cal are you in?

Sent from my SCH-I510 using Tapatalk 2
His post says he's in Westport,Louisiana bro.
He may stil be able to find someone local though to ensure it's done correctly
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  #16  
Old 12-04-2012, 8:18 PM
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Quote:
Originally Posted by nicoroshi View Post
His post says he's in Westport,Louisiana bro.
He may stil be able to find someone local though to ensure it's done correctly
Just don't take it to Red Jacket those dip ****s don't know anything
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Dick.
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  #17  
Old 12-04-2012, 8:20 PM
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Originally Posted by kcstott View Post
Just don't take it to Red Jacket those dip ****s don't know anything

That there is sig line material
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  #18  
Old 12-04-2012, 8:52 PM
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Quote:
Originally Posted by kcstott View Post
Just don't take it to Red Jacket those dip ****s don't know anything
Sure they do.
They know how to copy others stuff and market it as theirs.
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The smart, learn from their own mistakes.
The others, well......they just never learn.

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  #19  
Old 12-04-2012, 9:19 PM
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Originally Posted by SJgunguy24 View Post
Sure they do.
They know how to copy others stuff and market it as theirs.
Neva ben dun befo

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  #20  
Old 12-05-2012, 5:05 AM
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It's amazing what is considered good TV material
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Quote:
Originally Posted by ar15barrels View Post
Dick.
The above statement i consider a term of endearment
Need prints for your build? Need reference materials for Gunsmithing projects, Click Here
I fear that even though as tough as life has been for me I have only begun to pay for my sins.
Don't forget to have your Liberals spayed or neutered !
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