Rethreading a threaded barrel

nutmik

nutmik

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Hi folks,
Recently bought a rifle with a threaded barrel, I thought the threading was 1/2 X 28, but it turns out to be 1/2 X 20.
Any idea what a gunsmith might charge to rethread it to 1/2 X 28 ?
The crown is recessed in the barrel about 1" and the threading extends about 5/8" past the shoulder (Anschutz).
I don't want to take any risks that may affect accuracy.
Any help would be greatly appreciated.
Thanks, Mike
 
Depends on the gunsmith, might be cheaper to ship it to someone who does barrel work often rather then someone local. Also depends how the barrel is attached.

I mean it's not a difficult operation but certainly not easy, turn between centres and cut thread concentric with the bore, takes more time to setup than it will to cut.
 
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Ignoring any gunsmithing thoughts, and just going on the re-threading.

If you do not cut down the barrel, and just try to run over the old thread pitch, with a new pitch, you will turn that area into hamburger. Would it work? Maybe?

There is almost nothing I would actually trust to be affixed to anything with two different thread pitches, cut/superimposed over each other.
 
nutmik said:
Hi folks,
Recently bought a rifle with a threaded barrel, I thought the threading was 1/2 X 28, but it turns out to be 1/2 X 20.
Any idea what a gunsmith might charge to rethread it to 1/2 X 28 ?
The crown is recessed in the barrel about 1" and the threading extends about 5/8" past the shoulder (Anschutz).
I don't want to take any risks that may affect accuracy.
Any help would be greatly appreciated.
Thanks, Mike
Click to expand...

Why? what do you want to screw on?
 
Thanks for the replies everyone,
I won't be recutting the existing threads, I would definitely take it to a reputable gunsmith, if it's even worth it.
I just ran across thread adapters while searching google, seems like a reasonable alternative if they're any good, specifically made for barrel threads.
Mike
 
I don't know how you would make a thread adapter for 1/2 x 20 to 1/2 x 28... a 1/2 up to a larger size would be no problem...

I am sure most 'gunsmiths' who thread could set that barrel up, machine off the existing threaded portion, turn a new diameter and precisely thread for 1/2 x 28 for $75.
 
Jake1911 said:
Depends on the gunsmith, might be cheaper to ship it to someone who does barrel work often rather then someone local. Also depends how the barrel is attached.

I mean it's not a difficult operation but certainly not easy, turn between centres and cut thread concentric with the bore, takes more time to setup than it will to cut.
Click to expand...

Send it to Jury Custom Barrels in Red Deer. It may require shortening and then re-threading.
 
guntech said:
I don't know how you would make a thread adapter for 1/2 x 20 to 1/2 x 28... a 1/2 up to a larger size would be no problem...

I am sure most 'gunsmiths' who thread could set that barrel up, machine off the existing threaded portion, turn a new diameter and precisely thread for 1/2 x 28 for $75.
Click to expand...

A thread adapter would definitely be larger.
 
with the barrel removed its a pretty simple task for a decent machinist to cut off the thread existing, re face and cut a new 1/2 28 on the end, yes its shorter by the thread removed but works better than using a adapter, it would take under half hour to setup and thread,
 
It's a Levang compensator ( Dlask ) , I've had it for a few years , not that a 22 needs a compensator, but it directs all the gasses and lead etc. more directly away from the shooter
 
laurencen said:
as its a 22 you could turn the threads down to 3/8 and shrink a sleeve over threaded 1/2 28, easy task to do,
Click to expand...

This is of course the correct method if barrel length is critical and must be maintained for what ever reason (minimum legal length). However you have your sequencing wrong..........turn off threads, turn sleeve oversize OD and .002" undersize ID, heat sleeve and shrink into place, chuck up centering to bore and turn to 1/2" and cut new threads.
I have done this process several times for other reasons just not on a barrel, but the process is very straight forward and when care is taken, it comes out perfect every time.
 
c-fbmi said:
This is of course the correct method if barrel length is critical and must be maintained for what ever reason (minimum legal length). However you have your sequencing wrong..........turn off threads, turn sleeve oversize OD and .002" undersize ID, heat sleeve and shrink into place, chuck up centering to bore and turn to 1/2" and cut new threads.
I have done this process several times for other reasons just not on a barrel, but the process is very straight forward and when care is taken, it comes out perfect every time.
Click to expand...

do lots of this type of work, I will usually make a sleeve already threaded in this case 1/2 28, the center is reamed as 3/8, next turn the barrel under the sleeve diameter 0.002 to 0.003 and heat the sleeve, slip it on and done, it will align perfectly and avoids setting up the barrel twice
 
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