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336 Barrel Removal

29K views 20 replies 12 participants last post by  jeffski07  
#1 ·
I'm having my barrel cut and re-crowned on my 336xlr. My smithy is doing some research on removing the barrel so he can chuck it up in a lathe. He has never removed a barrel from a 336. (his expertise is AR type guns and pistols). So, is this removal going to be a big deal? I assume the barrel is just threaded into the receiver?
 
#3 ·
Thanks, that was the info I needed.
 
#4 ·
Just a note for info, I've read that some Marlins have had a thin shim installed between the barrel and receiver during assembly, and to look for that to make sure it is not lost or damaged during the barrel rework. If it does have a shim, make sure it gets put back in place or you may have head space issues. I don't recall all the details off-hand, or how common it is in any models, but would be something like a few thousands thick or so if having one. Good luck to you.
 
#5 ·
I'll pass along that info. Thanks.
 
#6 ·
Even though it's relatively the same as any other action/barrel removal, damage can be easily be done without proper thinking. First, an index mark should be placed to easily return the barrel to it's original position. I use a barrel vise and a universal action wrench with the head reversed along with brass shims. Masking tape is also applied to the action. Brass shims and tape are a bit overkill but I do not like scratches. I milled out an aluminum block to fit inside a gutted receiver for support to preventing twisting or bending of the action. If the action is not gutted, the extractor should be removed and the bolt backed out just enough to clear the chamber hood. The lever could just be fully opened to get the bolt all the way back, but I want as much support inside the action as possible.
 

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#8 ·
Gut weapon and reinstall floor and tighten all three screws, front bottom, side and rear hammer. I use thin cardboard (cartridge box, back of notebook stuff) to protect finish on receiver. I also take very sharp punch and hit in corner of barrel/receiver juncture for return to point confirmation index mark. Clean with acetone and Blue 242 Loctite back on tighten. You should by hand feel it hit somewhere about 7 to 10 degrees on hand tight for proper torque. If you are only irons you can square from top of receiver and use dovetail of rear sight for check. Yes it can be done without removal, I like to put 11 degrees on mine. If you have all the right stuff and is no big deal, trying without proper tools will lead to tears!
 
#11 ·
This is possible if the lathe headstock is short enough for the barrel to reach past the chuck jaws. About 20 inches on my smallest lathe. Some bolt action receivers can
fit into the spindle a little ways but not a lever action.
 
#12 ·
Maybe I'll look around for another smithy.
 
#14 ·
Crowning a muzzle can be quite the controversial subject. It all comes down to the end result being good enough or the best possible. I cannot see the latter accomplished without removing the barrel and using a lathe, but a lot of guys get the the heebie jeebies with even the thought of the barrel coming off. Dave Manson probably has the next best alternative. Below is a link to a video showing his product.

BuffaloBob, the link to this video might be just what your Garand needs.
 
#16 ·
Ok, my smithy is just going to cut and square the barrel tomorrow morning. He can do this on the gun without removing the barrel. Then I will use the brass screw method to slightly crown the barrel.
 
#17 ·
I just had mine recrowned. I didn't remouve the receiver, I just pulled the little screw and watever it holds in (a spring and a little point???) then tried by hand and when nothing turned I read that barrel removal is not reccomended. The smit took 4 months to jig and recrown and I can't remember what goes where.
I'm talking about the screw, spring and point, not stripping the mecanism.:hmmmm:
 
#20 ·
I would NOT remove the Barrel for re-crowning.

When the barrel is first installed, the threads may stretch a bit in the last 5-7 degrees, and so the barrel may not torque up properly at re-assembly so the use of a barrel shim will be required.

How many North Haven barreled receivers have a shim?...................probably less than 8%........no, you can't really see it.

With a little care and skill, a very good crown can be had with a hand operated crown cutter.

Tom