Aftermarket vs factory barrel

[Alan]

What were your expectations when you decided to upgrade to a new barrel, and how did the actual performance stack up? Did the aftermarket barrel really make a noticeable difference, or were the improvements just slight?

 

[Jester560]

When I was shooting NRL22, I built a CZ457 with a Lilja barrel. At 50 yards, with high end ammo, it would shoot a one hole group. The factory barrel would shot moa at 50.