M1 Garand Barrel Replacement â€“ New Barrel[1]

7/26/2019 M1 Garand Barrel Replacement New Barrel[1]

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You will need the following tools and materials to complete this job

correctly:

* Barrel Vise, * Action wrench, * Kroil (recommended) or other highquality light penetrating oil, * Bench vise or gun vise, * A magneticangle finder (Harbor Freight for


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Place the barreled action in a padded vise, receiver down, barrel

u and a l Kroi l to the area between the receiver and the barrelshoulder.

At the very least, allow the Kroil to work overnight to penetrate thethreads of the barrel/receiver. If your original barrel breech is in theblack you should let the penetrating oil work for at least 24 hoursand it should be applied multiple times. Lightly tapping the receiverw a rass ammer n e area o e rea s a ew mes ur ngthe soak will enhance the penetration process.

NOTE: If you plan to lap the bolt/receiver do so before removing theold barrel or before finish reaming the new barrel.


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Strip the receiver, and place the barreled receiver in your barrel

. . .


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Cut a piece from the aluminum can the width of your action

wrench. This is to rotect the finish on the receiver when usinthe wrench.


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Wrap the piece of foil around the receiver in the area of the

..


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Place the action wrench over the receiver being careful that the


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Be sure your vise is on a secure platform, brace yourself and pull

hard on the wrench in a counterclockwise direction (lefty loosely).

designs (not usually on the pictured CMP wrench).


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Unscrew the receiver from the barrel and set it aside. Remove the

.


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Use a small wire brush and Kroil to completely clean the receiver

. .


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This is why you soak the threads with Kroil overnight. Note how

the Kroil enetrated the threads makin barrel removal mucheasier.


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Li htl coat the barrel threads and receiver face with anti seize


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Place the new barrel in the barrel vise leaving the bolts just loose

enough so you can rotate the barrel in the vise. With a CMP barrel

(thats why I like this type of vise)


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Slide your gas cylinder (with front sight removed) on the end of the barrel

at least half way (with a new Criterion barrel you may have to apply

grease to the barrel splines and tap the cylinder on before placing thebarrel in the vise). Place the magnetic angle finder (or small machinist

level) on the sight dovetail (be sure there are no burrs on the dovetail that

could effect the accuracy of the level) and rotate the barrel unti l it s level

.

sure the barrel stays level while you tighten.


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Screw the receiver onto the barrel until it sto s


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The receiver should be in approximately this position + or a few degrees

after hand tightening. A bit tighter is fine as long as it doesnt travel more

than about 10 degrees before zero but, a whole lot looser might mean youneed to have a machinist set back the barrel shoulder a tiny bit before

indexing (not common).


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Reinstall the aluminum insert and the action wrench


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Tighten the receiver on the barrel a bit, check that the barrel assembly is

sti ll level, remove the angle finder or level from the cylinder dovetail and

.receiver is about 5 degrees from zero/index.


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Continue tightening the receiver until the angle is zero or level


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Once the receiver indicates its at zero or level, remove the angle

finder/level from the receiver and place it back on the gas cyl inder to

.that index is correct. Congratulations, your receiver/barrel is indexed!!


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Position of bolt lug to receiver with new short chambered barrel installed.

.


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Lay out your workspace with the items needed. Be organized. Also have

rags available and a pan under your work. This process can be messy ifdone right.


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Pour your cutting fluid into a container, dip the plastic brush into the oil

. .


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Place the bolt into the receiver. Dip your reamer into the oil , install the

bushing on the bolt end of the reamer and sl ide it part way into the

.the barrel and, turning it clockwise, thread it into the end of the reamer.


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Using your f inger under the receiver behind the bolt, ease the reamer into

.


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While applying light pressure to the back of the bolt with your finger,

slowly rotate the reamer clockwise with the handle. Observe the bolt

.

Go slowly, take your time and only apply enough pressure that reamer

cuts. You dont want the reamer to chatter or jam from too much

pressure.


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Once the bolt lug is about half way to closing to battery, pull the bolt

rearward, slide the reamer back out of the chamber, unscrew it from the

.

Most reamers have a flat that a small wrench can be used to facilitate

removal from the extension arm. Remove the bolt from the receiver.


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Clean all parts and the reamer with solvent to remove all metal

shavings and debris. Blow out the chamber with high pressure air and

run a patch through the chamber from the breach end to make sure allshavings and debris are removed.

Place the barreled receiver back in the vise.

Place the bolt back in the receiver

Coat the chamber with cuttin oil as ou did reviousl .

Coat the reamer with oil and screw back on the extension arm.

Move the bolt against the reamer bushing and slide it slowly back intothe chamber.


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As before, reach under the receiver, apply light pressure to the back of

the bolt ushin the reamer into the chamber a ainst the shoulder of thechamber. Slow turn the reamer in a clockwise direction until the bolt lugs

just close to battery.


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Just closed during reaming


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As before remove all tools and the bolt.

Flush the chamber with solvent, blow it out with air and run a patch

down the barrel from the breech to remove all cuttings and debris.

Clean the bolt and receiver.

Wipe the chamber dry with a clean patch and check the face of thebolt for debris.


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,slide the bolt toward battery. It should easily lock into full battery with no

pressure applied to the bolt (see picture on left). If it passes the Go insert

the No Go gage into the chamber and move the bolt against it. It should

no c ose s ou oo s m ar o e p c ure on e r g .


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If for some reason the bolt will not close on the Go gage you willnee to ream t e c am er a t more.

Follow the same procedure sans the bolt, apply very light pressureback on the extension rod handle and only turn the reamer one or

-with the Go gage.

Once it closes on the Go gage YOUR DONE!! You now have an

indexed head s aced and accurate barrel to win that Gold at theCMP games

Be sure to follow proper procedure to break in the new barrel:http://www.kriegerbarrels.com/Break_In__Cleaning-c1246-wp . m s e proce ure e o use.

M1 Garand Barrel Replacement â€“ New Barrel[1]

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