I have only shot it with a scope but I didnt even have to adjust the scope when I put it on. It hit dead on. I can pull the base off and shoot it straight bead if you want to know for sure I guess. I dont have my bench here so it will be off hand but I can tell if close or not I think. Based on my previous results I think it would be..
I usually use either a scope or aftermarket sights on my guns even if they shoot straight though because I just like the extra fine tuning an visability of those sights.