Yeah, that’s it if you’re talking about the lighter AI barrel contour. My factory 20” 308 has a real short breach length and tapers fast down to .88” at the threaded shoulder. Thanks!!I think your talking about the 6518 contour. Has a really short breech length and then a quick taper down to like .900" diameter and it's .900" at the muzzle correct?
That contour would be lighter than a M40 contour.
Muller’sNot sure what/who's #5 contour you are talking about.