[ARCHIVED THREAD] - Identifying a 1-7 barrel

Posted: 11/20/2005 9:00:41 AM EDT

Hello.
I have an m16, and its barrel is stenciled with: "5.56 NATO 1/7", which means that it can fire the m855 (green) bullets.
What's the difference betw/ my barrel and the standard M16A1 barrel? can I see it visually by looking through it?

Posted: 11/20/2005 9:47:39 AM EDT

[#1]

M16A1 barrel is 1 in 12 twist which means the rifling ( lands and grooves ) will cause the projectile to rotate one complete revolution every 12 inches. 1 in 12 is not fast enough to stabilize heavier rounds effectively.

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Posted: 11/20/2005 9:50:41 AM EDT

[#2]

Okay. That I already know.
Now I have two questions:
1. Say I have a barrel, and I don't know if it's 1/7 or 1/12 twist, can I identify which one it is by looking through it?

2. If I fire the green-tip ammo which is fitted to the 1/7 twist on a standard 1/12 twist, what will happen?

thanx

Posted: 11/20/2005 10:37:49 AM EDT

[#3]

1. Yes, look inside at the rfling, the 1/12 will twist rather slow compared to the 1/7

2. the heavier bullet will tumble

Posted: 11/20/2005 10:45:24 AM EDT

[#4]

first of all thanx.

About the 2nd answer, it will tumble but it won't get stuck / explode in the barrel or something like that, right?

Posted: 11/20/2005 12:03:16 PM EDT

[#5]

For #2, the 1:12 twists don't spin the bullet enough to make it stable in flight. It will leave the bore just fine, but may not shoot worth anything.

Posted: 11/20/2005 12:21:45 PM EDT

[#6]

Thanx very much

[ARCHIVED THREAD] - Identifying a 1-7 barrel

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[ARCHIVED THREAD] - Identifying a 1-7 barrel

[ARCHIVED THREAD] - Identifying a 1-7 barrel