Gunsmithing AR15 barrel question

[Scuzy]

Greetings.

Are the threads for the barrel extension timed to the orientation of the gas port? Is this consistent between manufactures?

Thanks
Chris

 

[Bronco]

Re: AR15 barrel question

Other way around, extension is installed then gas port is drilled.

 

[Scuzy]

Re: AR15 barrel question

That's what I needed to know, thank you.