Gunsmithing Changing a chamber on a barrrel

[jbusby]

Ok here is a question some might think is dumb but here it goes. I have a 20 in 7.62 X 39 ar barrel and am wondering if i could get it cut down to a 16in barrel and rechambered to a 300 aac. It is just sitting there and I have been wanting a 300 whisper or fireball or aac for some time. So any ideas or advice on who might be able to do it or what not. Any help would be appreciated.
Buzz

 

[gunnergirl81]

Re: Changing a chamber on a barrrel

The .311 bullet dia. vs the .308 may reduce your accuracy depending on the bore size of the barrel. But honestly not knowing much about the AAC round thats all I can think of.

 

[Falar]

Re: Changing a chamber on a barrrel

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Kenda</div><div class="ubbcode-body">The .311 bullet dia. vs the .308 may reduce your accuracy depending on the bore size of the barrel. But honestly not knowing much about the AAC round thats all I can think of. </div></div>

It is basically .300 whisper, which means the case diameter is going to be smaller than the case diameter of 7.62x39.

 

[frog5215]

Re: Changing a chamber on a barrrel

The biggest problem will be the new gas tube hole and closing up the old one.
Unscrewing the barrel extension, shortening the 1/2" or whatever is necessary and rechambering/rethreading should present a competent machinist any problem.

 

[sinarms]

Re: Changing a chamber on a barrrel

you are going to have more money in a used barrel then you would in buying a new one

 

[jbusby]

Re: Changing a chamber on a barrrel

Ok thanks that is what i thought but it does not hurt to ask.
Buzz

 

[9H_Cracka]

Re: Changing a chamber on a barrrel

No shortage of reading on the internet after googling "762x39 subsonic".