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Old 09-23-2010, 12:32 PM   #1 (permalink)
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Rifle barrel cutting and crowning at home

**Of course no barrels will be cut below legal length without ATF approval**

If I wish to cut the barrel on an AK47 in 7.62x39 at home and not pay the local guy, what tools do I need? I have paid for cut/crown and threading before but would rather try it at home this go around.

How do I go about it?

Collars and a good hacksaw blade?

Various files?

One of these crown tools? http://www.midwayusa.com/viewProduct...tnumber=684575 Its out of stock...

(I plan on recrowning all the AK's and FAL's that have not been.)

I've read of using a carriage bolt and a drill with lapping compound?

I've shortened, legally, shotgun barrels, but a rifle is not something I wish to mess up accuracy wise. I still want the AK to be accurate after I chop it to size.
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Old 09-23-2010, 12:40 PM   #2 (permalink)
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Pretty sure Doc did a write up on recrowning a barrel somewhere.

Search is kicking my ass right now. Apparently searching USMCDoc14 posts with the words barrel and crown isn't specific enough.

I need to chop my GSG5, so I will be paying attention.
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Old 09-23-2010, 12:42 PM   #3 (permalink)
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Pretty sure Doc did a write up on recrowning a barrel somewhere.

Search is kicking my ass right now. Apparently searching USMCDoc14 posts with the words barrel and crown isn't specific enough.

I need to chop my GSG5, so I will be paying attention.
I've searched on and off the last few days and not found a specific how-to, but lots of good info. I think I (you) can do it with the tools I (you) have, but will buy a crown tool if I have to.

(I have watched the MIDWAY USA how to videos FWIW.)
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Old 09-23-2010, 12:56 PM   #4 (permalink)
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I too have heard of the bolt and laping compound and would like to hear more on that idea.
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Old 09-23-2010, 01:22 PM   #5 (permalink)
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**Of course no barrels will be cut below legal length without ATF approval**
What are you, a frickin lawyer? I make myself giggle


It all really depends on your standards of accuracy I suppose. Using a hand crowning tool on an AK that's been through hell and has obvious nicks in the crown can only improve things. Using the same tool on one of 300sniper's barrels, not so much. I think a large part of the quality of the crown obtained with that device is going to rely on the fit of the bushings to the bore. And that's all I can say about that because I have no first hand experience with them even though I've contemplated getting one for years.
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Old 09-23-2010, 02:32 PM   #6 (permalink)
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Quote:
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What are you, a frickin lawyer? I make myself giggle


It all really depends on your standards of accuracy I suppose. Using a hand crowning tool on an AK that's been through hell and has obvious nicks in the crown can only improve things. Using the same tool on one of 300sniper's barrels, not so much. I think a large part of the quality of the crown obtained with that device is going to rely on the fit of the bushings to the bore. And that's all I can say about that because I have no first hand experience with them even though I've contemplated getting one for years.
Funny guy....

(You need an AK if you don't have one....)

Just battle rifle accuracy.
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Old 09-23-2010, 03:00 PM   #7 (permalink)
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Quote:
Originally Posted by YellowIH View Post
I've searched on and off the last few days and not found a specific how-to, but lots of good info. I think I (you) can do it with the tools I (you) have, but will buy a crown tool if I have to.

(I have watched the MIDWAY USA how to videos FWIW.)
I'll look around this evening. IIRC he did it in one of the AK or AR build threads where he cleaned up a crown with a brass tack and lapping compound.
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Old 09-23-2010, 03:24 PM   #8 (permalink)
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There was a book written in the 50s that the author spoke of using crocus cloth and glass marbles to re-crown a cut barrel.
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Old 09-23-2010, 05:02 PM   #9 (permalink)
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Starting at the second post down.

http://www.pirate4x4.com/forum/showt...=638505&page=3
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Old 09-23-2010, 05:58 PM   #10 (permalink)
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and that's the way it is

YouTube - Gunsmith - Crowning the muzzle of a rifle barrel

this may be a better way to do it without a lathe though:

YouTube - Muzzle crowning tool kit for military rifles, by Dave Manson
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Old 09-23-2010, 07:58 PM   #11 (permalink)
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http://www.brownells.com/.aspx/cid=1...ing___Crowning
and a
Pipe cutter from lowes
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Old 09-23-2010, 08:22 PM   #12 (permalink)
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Quote:
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Pipe cutter on a rifle barrel?
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Old 09-23-2010, 08:28 PM   #13 (permalink)
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Quote:
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this may be a better way to do it without a lathe though:

YouTube - Muzzle crowning tool kit for military rifles, by Dave Manson
thats dude whistles a lot
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Old 09-23-2010, 10:07 PM   #14 (permalink)
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Quote:
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Quote:
Originally Posted by usmcdoc14 View Post
This is RETARDEDLY simple to do and can improve the accuracy of a
barrel quite a bit. This is also if you cut down a barrel to carbine length (this is done on a FAL barrel as an example)

First the shit you will need:
crown cutter (i got mine from www.brownells.com it is the 11* target crown cutter. 11* is a great crown as it performs well and the
countersink protects the crown)
guide dowel to fit the caliber you are doing (once again, brownells. .30
cal guide for AK/SKS/FAL )
handle of some sort for it (i used a 1/4 all thread nut and a old die.
or you can spend the cash on a handle. I don't recommend the drill bit
one as you want to take your time)
0000 steel wool
brass screw or brass ball bearing a little bigger than the cal. you are
doing a 1/4 screw is perfect for .308/7.62
valve lapping compound
cutting oil
hacksaw with a new blade


first i saw my crown was SHOT and also noticed that the barrel
was corroded at the ends of the lands

so i decided to cut it down to a 17.5 barrel because i should not have
to open the gas port (you may/may not need to open the gas port on any
gas operated weapon. the shorter barrel produces less pressure, hence
less to push the action back)
mark it square, i used an old pipe cutter to score it. plug the barrel
with a patch a distance past where you are cutting to keep shavings
out.

HACK SAW MOTHER FUCKER !!!

Now go and insert the crowning tool with guide dowel into the barrel.

USE LOTS OF OIL AT ALL TIMES AND CLEAR THE CHIPS

Apply good pressure and turn away. I rotate the barrel to a different
position every time i clear chips and re-oil so i don't get a low spot
from my hand pressure. Keep cutting until you have cut the ENTIRE barrel
face (this does not apply to Bull or target barrels as they may be
wider than your cutter. in that case stop when you get the recess you want) Once you do that
keep decreasing your pressure and keep cutting, keep getting lighter and
lighter till only the weight of the tool is on it. This give a nice
fine finish.

remove the tool and clean away any shavings.
Now take the steel wool and use it to get rid of the sharp edge on the
OUTSIDE of the barrel. The pic is over exaggerated i actualy only
used a small piece and rotated it around the edge with my thumb and fore
finger.
Next...
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Old 09-23-2010, 10:08 PM   #15 (permalink)
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Quote:
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next you find a way to hold your brass screw. I used a tap holder. If you are using a brass ball just skip to the next.

Dip it in your lapping compound and lap away !


just twist it back and forth. I once again changed barrel position and also the angle i was hitting at to make sure i did not get a low spot. Use a medium pressure, its better to take your time and do it right instead of too much.

Check your progress and stop when you get a nice hairline at the grooves (lands are the high spots of the rifling, grooves the bottom) you can just see it in the next pic.

Push out your plug/patch from the breech (dont push the lapping compound INTO the barrel ) and CLEAN THE SHIT OUT OF YOUR BARREL !!!!!

and TAADAAAAA!


you now have a barrel with a nice new 11 degree target crown I used a cold blue to protect it but it an be left bare as long as you oil it and remember its bare metal.
Found it. Thanks.
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Old 09-24-2010, 08:41 AM   #16 (permalink)
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Quote:
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Pipe cutter on a rifle barrel?
BIG pipe cutter and think full choke about 1/4-1/2" below the crown...



D.
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Old 09-24-2010, 06:44 PM   #17 (permalink)
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Quote:
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Pipe cutter on a rifle barrel?
Not a heavy barrel, but Ak barrel. Yes BDTD
Just go very slow.
Obviously never did this on a customer firearm, but my own stuff, why not.
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Old 09-24-2010, 07:56 PM   #18 (permalink)
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Not a heavy barrel, but Ak barrel. Yes BDTD
Just go very slow.
Obviously never did this on a customer firearm, but my own stuff, why not.
Slug the barrel and measure what ye get for dims near the breech and close to the point of the cut. Pipe cutters are real good for "necking down" some depending on the blade condition.

D.
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Old 09-25-2010, 06:52 AM   #19 (permalink)
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I follow up the pipe cutter with the 11* cutter.
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Old 09-25-2010, 07:32 AM   #20 (permalink)
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Slug the barrel and measure what ye get for dims near the breech and close to the point of the cut. Pipe cutters are real good for "necking down" some depending on the blade condition.

D.
yep. i would almost bet the bore would be distorted much further in than an 11* crowining tool would remove.

someone did some microscopic tests of the barrel steel after a parting tool had been used to remove the excess barrel length. believe it or not, a parting tool in a lathe actually distorts the bore of a rifle barrel. i still use a parting tool but leave about .25"-.3" to remove with a facing tool. some people refuse to use a parting tool at all and remove the excess length with a bandsaw.
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Old 09-25-2010, 07:43 AM   #21 (permalink)
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is a bandsaw the preferred method? If I do this PSL thing I may be chopping it down a bit and a bandsaw would certainly be easiest for a quick straight cut.

Fine toothed blade I assume.
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Old 09-25-2010, 09:47 AM   #22 (permalink)
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All cutting methods distort the host material to some extent. A bandsaw works well and distorts relatively little.
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Old 09-25-2010, 02:27 PM   #23 (permalink)
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All cutting methods distort the host material to some extent. A bandsaw works well and distorts relatively little.
So is a hack saw going to be almost as good as a band saw?
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Old 09-25-2010, 07:04 PM   #24 (permalink)
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Yes, hacksaw and the Brownells tool are perfectly fine for manual methods. When I turn a barrel, I bandsaw off all but a 16th.
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