View Full Version : Mint Unissued Chrome Lined IMI Galil 18in Barrels Pt. II

Sayeret Shaldag
11-09-2006, 11:57 PM

Here are some photos of the threaded muzzle end area where the Twist markings are. Again please let me know what you all think.

11-10-2006, 06:36 PM
Looks good, but what does the different twist rate do? So long as I hit Paper Im a happy camper.

Sayeret Shaldag
11-10-2006, 09:40 PM
Suka I agree as I dont do much long range shooting, but the

1-12 came first it was for the 55gr projectile

1-7 came later it was for the 62gr projectile

You know better than me Suka, but this is what I read.

11-11-2006, 05:25 AM
"1-12 came first it was for the 55gr projectile

1-7 came later it was for the 62gr projectile"

Yep. That's it.

11-11-2006, 10:12 AM

Freedom Eagle
11-11-2006, 12:45 PM
I believe you cannot use old 5.56mm 55 grain ammu in a rifle with 1-7 twist. i maybe wrong since Im not an expert, so feel fre to give your advice/opinion. The same goes for newer SS 109 ammo (forgot US designation M-?) and the heavier grained rounds in current military use cannot be used in rifles with 1-12 twist. I might be incorrect but i believe the South African R-4 used a 1-9 twist allowing it to use heavier grain bullets.

11-11-2006, 02:35 PM
This is my understanding.

The 1-12 twist is good for 55 grain bullets and may do well with some 62 grain bullets. You have to see what you gun likes.

The 1-7 twist is good for 62 grain bullets and may do well with some 55 grain bullets. You have to see what your gun likes.

The reason they started making the 1-7 twist barrels was because the long range 62 grain tracers are really looooooong and need the fast twist. The 62 grain penetrator rounds are not as long and so don't need such a fast twist to be accurate, but since tracers are used along with the penetrator rounds in the military, they went with the fast twist.

I think about the only way to make everyone happy would be to offer twist rates from 1-2 to 1-18 in increments of 1/64" and all barrel lengths from 2'' to 96".

You'd probably still have some complaints, though. :jester

Many people like a 1-9 twist as it represents the 'best of both worlds' to them. The 'sweet spot' where they can use 55 grain or 62 grain ammo with equal good accuracy. That's the theory anyway.

It doesn't always work out that way. There are some 'rules of thumb' regarding twist rates and bullet weights, however, there really is no getting around the fact that you must try different ammo in your gun to see how it behaves.