I have the basic standard weight barrel NEF. Mine, strait out of the box, except for a shim on the forearm lug, shot sub 5/8” groups at 100 yards. I did notice a little “Walk” when the barrel started getting warm. My stock trigger pull was horrible (7+ pounds!), and I hate the over travel. I just finished lightening my trigger pull and polishing the internals, so I might be able to tighten up the group a little bit.