Thanks, that's the same OD as a Winchester M70 LT Sporter at 24".
It's a good size IME and makes for a good balance, particularly with the lighter overall weight of the X2 rifle.
For those familiar with Remingtons, their standard sporter contour is .650 or .660 at the muzzle while their mountain rifle contour is .550. I had a LH Winchester .30-06 rebarreled with a 22" barrel in my patent pending "Foothills contour" which is a Remington contour shape but .600" at the muzzle; it has a great balance.
