[ARCHIVED THREAD] - RRA Pre-ban upper Thread count

Posted: 4/4/2004 10:04:49 PM EDT

I am about to order an RRA 9mm upper for a preban lower that I just got. I am thinking of adding a suppressor. Is the flash hider treading the same as a .223?

Thanks in advance

Derek

Posted: 4/5/2004 3:59:10 AM EDT

[#1]

I believe RRA follows the Colt pattern here. The thread on the 9mm barrels is NOT the same as the .223, as they didn't want some lowest-common-denominator-type screwing on a .223 flash hider and trying to swage a 9mm bullet through it.

9mm is 1/2-36, .223 is 1/2-24 (IIRC).

Posted: 4/5/2004 6:12:03 AM EDT

[#2]

Colt 9mm thread is 1/2-36. They used the same on 7.62x39mm barrels as well. I use a AAC Phantom threaded 1/2-36 on my RO635 upper (10" 9mm) and it works great.

Posted: 4/5/2004 6:43:05 AM EDT

[#3]

9mm uppers ar 1/2x36tpi, .223 uppers are 1/2x28tpi. I confirmed that with Eric at ADCO a week ago, and it is in the FAQ thread at the top if you forget [;)]

Posted: 4/6/2004 3:56:40 AM EDT

[#4]

I need to let the coffee kick in before posting stuff in the A.M. I knew something didn't look right when I gave 1/2-24 as the thread size for the .223, but submitted before I could dredge the proper info out of my soggy old brain.

Yes, the correct thread is 1/2-28!!!!!!!!

Thanks for the polite correction, and I will second the use of the AAC Phantom. I also have one that I use on a 9mm upper and it works very well.

[ARCHIVED THREAD] - RRA Pre-ban upper Thread count

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[ARCHIVED THREAD] - RRA Pre-ban upper Thread count

[ARCHIVED THREAD] - RRA Pre-ban upper Thread count