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10/20/2017 1:01:18 AM
9/22/2017 12:11:25 AM
Posted: 9/19/2005 3:00:16 PM EDT
what is this tube raiser? and what is the meaning of this when somebody say 1:7 or 1:12?
Link Posted: 9/19/2005 3:12:33 PM EDT

Originally Posted By Niro:
what is the meaning of this when somebody say 1:7 or 1:12?

This is the twist rate of the rifling in the barrel. There are other twist rates including 1:9. Hope this helps. I have no idea what the first part of your question is though.
Link Posted: 9/19/2005 3:25:04 PM EDT
When someone says 1:7 they mean that the rifling makes 1 complete revolution in 7 inches of barrel length.

The same is true with other numbers. 1:8, 1:9, 1:12, 1:14, etc.

The smaller the second number, the tighter (and faster) the twist.

Link Posted: 9/19/2005 3:25:13 PM EDT
Hokay. Since this is a firearms site most here would recognize the two number groups as the pitch of the rifling in a barrel.

This ratio is commonly called twist rate.

Mild Bill


Link Posted: 9/19/2005 3:25:22 PM EDT
[Last Edit: 9/19/2005 3:26:10 PM EDT by Beefypeanut]
It makes the bullit spin at a different rate
1:7 is better for heavier bullets while 1:12 is better for light bullets. The M16A1 that the US used during the Vietnam war was 1:12 and the one we use now is 1:7
Link Posted: 9/19/2005 3:55:34 PM EDT
thank u all
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