Twist is related to a few thngs, but it's a stabilization issue related to the bullet grain. My next upper will be 1:9 because I generally use 62+ gr. rounds. 1:7 is cool for the 55gr. Google twist rates for AR15 barrels

http://www.ammo-oracle.com/body.htm#whattwist

ect ect

Check out the legal firearms transfers guy (Pete I think) on EE at ARFCOM. I just spoke with him yesterday and he's got so really solid deals on RRA. Just don't know if the shipping offsets the price savings.

Have you tried calling or emailing Eagle? They might not have the website updated.