Just built two 308AIs with .3355 necks(for unturned Winchester brass) and long throats. One for me and one for my best friend. Tan rifle has 26" Shilen barrel in a #6contour. The green rifle has a larger diameter Hart barrel and bigger brake. Gunkote matte black coatings. Both are shall shank Savages but I made the green rifle with a small shank tenon and a large shank nut thread(use large shank nut) so we could keep a larger barrel diameter and keep the barrel nut both. You'd really have to know what you are looking for to be able to tell. I run 208Amaxs at 2605fps with R17 powder. We've both shoot under 4" 5 shot groups at 600yds. Great rifles.