RRA 9mm AR15 thread pattern question > Rimfire and Pistol Calibers

Posted: 1/29/2008 10:15:34 AM EDT

Can someone please tell me the thread pattern on the RRA 9mm upper? I need this information for the suppressor. Thanks.

Posted: 1/29/2008 10:47:27 AM EDT

[#1]

1/2-36

Posted: 1/29/2008 10:52:00 AM EDT

[#2]

Quoted:
1/2-36

Thank you sir.

Posted: 1/29/2008 11:34:55 AM EDT

[#3]

Are all 9mm the same? I have a bushmaster will flash hiders and such be interchangeable with other brands 9mm's

Posted: 1/29/2008 6:39:36 PM EDT

[#4]

Quoted:
Are all 9mm the same? I have a bushmaster will flash hiders and such be interchangeable with other brands 9mm's

I only know for sure about RRA.

Id call Bushmaster if i was you.

Posted: 1/29/2008 6:50:56 PM EDT

[#5]

I have seen threads on 9mm barrels 1/2x28 , 1/2x32 , 1/2x36
I dont know why they dont use the same threads.
My Noveske 9mm barrels are 1/2x28
and my garrison barrel was 1/2x32 until I chopped it and thread 1/2x28

Posted: 1/29/2008 9:51:15 PM EDT

[#6]

My understanding is that they are not threaded 1/2-28 to pevent instaltion of a .223 flash hider. Which would KABOOM when fired.

Posted: 1/30/2008 7:41:17 AM EDT

[#7]

Quoted:
I have seen threads on 9mm barrels 1/2x28 , 1/2x32 , 1/2x36
I dont know why they dont use the same threads.
My Noveske 9mm barrels are 1/2x28
and my garrison barrel was 1/2x32 until I chopped it and thread 1/2x28

Check here: AR-15 barrels faq and scroll down to a table of recommended thread sizes.

Interesting reading.

Posted: 1/30/2008 4:18:49 PM EDT

[#8]

Quoted:

Quoted:
I have seen threads on 9mm barrels 1/2x28 , 1/2x32 , 1/2x36
I dont know why they dont use the same threads.
My Noveske 9mm barrels are 1/2x28
and my garrison barrel was 1/2x32 until I chopped it and thread 1/2x28

Check here: AR-15 barrels faq and scroll down to a table of recommended thread sizes.

Interesting reading.

I agree on the larger threads but you dont see many 9mm barrel with larger than the 1/2 x28,32,36 for sale.
I needed 1/2x28 for my EVO9 can and 3 lug adapters.
I have not heard of anyone breaking there barrel at the threads yet.

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