[ARCHIVED THREAD] - Mil Spec for Thread Pitch?

Posted: 11/16/2014 6:22:55 PM EDT

Looking to buy a Smith Vortex flash hider to put on a Stag 3L.

First time changing out a barrel device and I want to make sure I'm getting the right pieces and parts.

Is there a standard Mil Spec for the thread pitch on an AR15, 5.56 with 1/9 twist?

Posted: 11/16/2014 6:24:33 PM EDT

[#1]

well 1:9 isn't mil spec, but the standard 5.56 flags hider is 1/2 x 28

Posted: 11/16/2014 6:49:09 PM EDT

[#2]

Thanks for the input. That's the thread pitch that the hider I was looking at is, so that's good.

What is the Mil Spec for barrel twist, while we're on the topic?

Posted: 11/16/2014 6:49:21 PM EDT

[#3]

Quote History

Quoted:
well 1:9 isn't mil spec, but the standard 5.56 flags hider is 1/2 x 28

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This. Mil-spec is 1/7 twist. But it's (and yours) thread pitch is 1/2 x 28

Posted: 11/16/2014 6:58:29 PM EDT

[#4]

Thanks for the info guys.

1/7 stabilizes heavier bullets than 1/9 can?

Posted: 11/16/2014 7:01:13 PM EDT

[#5]

Quote History

Quoted:
Thanks for the info guys.

1/7 stabilizes heavier bullets than 1/9 can?

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Pretty much. It BETTER stabilizes the heavier (longer round) than 1/9 does. The military adopted 1/7 twist to better stabilize M856 tracers, while still adequately stabilizing M855 as well.

[ARCHIVED THREAD] - Mil Spec for Thread Pitch?

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[ARCHIVED THREAD] - Mil Spec for Thread Pitch?

[ARCHIVED THREAD] - Mil Spec for Thread Pitch?