rethreading 5/8"-24 to 1/2"-28

[Mikewood]

Is it possible to Rethread a rethreading 0.30 cal barrel that is threaded for 5/8"-24 to 1/2"-28?
Given that it will handle the pressure is there enough meat to turn off the threads and recut the new finer threads?
Thanks.

 

[LJH]

This is like a trick question. But to answer it, yes you can thread a .30 barrel to 1/2X28. Yes it will handle the pressure (of threading?). Is it a good idea, not really. Too many item made for the .22 barrels fit that thread. This could be a disaster waiting to happen.

What is it that has 1/2" threads that you want to attach to a .30 barrel?

 

[chubbyzook]

Not a trick question, turn barrel down to a .495 od. Then thread like normal. The only Problem is your wall thickness will a little less than .100, if you plan on putting a muzzle device on you will get back most of the strength you lost.

 

[Mikewood]

Just about everything AR related is 1/2x28 including my 5.56, 9mm can and all my ARs. It's simple enough not to screw my 5.56 can on my 9mm AR upper so I plan to rebarrel one of the ARs to 300 BLK and it would be simple enough to have the can re-baffled and the barrel threaded at the same time. I can still use that can on my 5.56 guns granted with greater volume but its a supersonic round anyway. When I want to be quiet I shoot subsonic.

 

[scap99]

Just spin the 9mm can onto the 300BLK barrel using an adapter.


Also, you might want to double check the re-baffle idea. Read Q5 at the bottom of page 177 (37 of 38 pages in the pdf).
http://www.atf.gov/publications/download/p/atf-p-5320-8/atf-p-5320-8-appendix-b.pdf

You'd have to buy another tax stamp for that modification.

 

[ZX9RCAM]

Deleted.....I believe you are correct.