pa2a.org


Share Thread:  
AR Twist Rate
#1
I'm currently looking at uppers online for my first AR, I'm going cheap this time to figure out what I like and don't before I start dropping serious money on quality. I've found a lot in 1/9 as well as 1/7 twist rate. I can buy the same setup in 1/9 for almost $60 cheaper and I'm wondering why. I've heard the marines switched the M4 to the 1/7 but I'm not sure for the reasoning behind it... or if that's in fact true. Like I said, this is my first so it's not going to be a competition rifle.

Also the uppers I'm looking at are A3 16" moly/chrome lined, if that makes any difference.
My guns have killed less people than Obama's ATF has.
Reply
#2
silkworm;9376 Wrote:I'm currently looking at uppers online for my first AR, I'm going cheap this time to figure out what I like and don't before I start dropping serious money on quality. I've found a lot in 1/9 as well as 1/7 twist rate. I can buy the same setup in 1/9 for almost $60 cheaper and I'm wondering why. I've heard the marines switched the M4 to the 1/7 but I'm not sure for the reasoning behind it... or if that's in fact true. Like I said, this is my first so it's not going to be a competition rifle.

Also the uppers I'm looking at are A3 16" moly/chrome lined, if that makes any difference.

1/7 twist rate stabilizes a heavier bullet better.
He was the sort of person who stood on mountaintops during thunderstorms in wet copper armour shouting "All the Gods are bastards."
Reply
#3
You want 1: 7 or 1: 8 - that way you can shoot heavier bullets. 62gr. is about the limit of 1: 9, but for a varminter rifle, you may want a 1: 9 to shoot LIGHTER bullets.

Hope that helps!
The War Wagon, proud to be a member of pa2a.org since Sep 2012. Anim_banana

[Image: won-rev-big-2.jpg]
Reply
#4
Get the 1:7 or a 1:8.
Reply
#5
I am fan of 1:8 myself.
Some people need to read this book: http://www.amazon.com/dp/1936976021/ref=cm_sw_r_awd_bs5jwbZH1GAZF

Reply
#6
1x7" ...........there's a reason Colt makes this barrel standard for their models (at least from what I am aware of)
[Image: pa_zps59e4c512.png?t=1379682235]
Reply
#7
39Flathead;9558 Wrote:I am fan of 1:8 myself.

1 in 8 is pretty sexy. I'm a fan.
One must still have chaos in oneself to be able to give birth to a dancing star.
Reply
#8
39Flathead;9558 Wrote:I am fan of 1:8 myself.
Reply
#9
Philadelphia Patriot;9562 Wrote:1x7" ...........there's a reason Colt makes this barrel standard for their models (at least from what I am aware of)

Sooo... What is the reason for the slow twist rate in a Colt when it will fire the same ammo as the guns using faster rates?


Also, early Colts were 1:14, 1:12.
A few people have recently found this out after buying surplus SP1 type kits and finding they shot like crap.
Some people need to read this book: http://www.amazon.com/dp/1936976021/ref=cm_sw_r_awd_bs5jwbZH1GAZF

Reply
#10
39Flathead;9831 Wrote:
Philadelphia Patriot;9562 Wrote:1x7" ...........there's a reason Colt makes this barrel standard for their models (at least from what I am aware of)

Sooo... What is the reason for the slow twist rate in a Colt when it will fire the same ammo as the guns using faster rates?


Also, early Colts were 1:14, 1:12.
A few people have recently found this out after buying surplus SP1 type kits and finding they shot like crap.

Since they use 1:7 twist rate barrels so that people can shoot heavier rounds more accurately. Since colts are government issued, the 1:7 barrel is better because the government also issues (typically 62 grain) 60+ grain rounds.
[Image: pa_zps59e4c512.png?t=1379682235]
Reply








Users browsing this thread: 1 Guest(s)

Software by MyBB, © 2002-2015 MyBB Group.
Template by Modogodo Design.