I could be wrong but have heard that the ATI O/U's are built by the same company that builds the Mossberg's. If that is the case I have a 20ga and a 12ga ATI Turkey Fowl. I bought the 20 first and was very happy with it. Barrel regulation was near perfect as I shoot a tight Indian Creek .562 in top barrel and an Improved Cylinder in bottom. Now the 12ga was a different story. I use tight .655 Indian Creek in top and tried numerous choke/shell combinations in bottom but it would print 6" low at 30 yards. Finally yesterday I decided I would sacrifice an old Carlson .680 Extended choke and file on it to see if I could change the POI and I got it really close. Moved POI up to about 2"-3" low and very acceptable now at 30 and in. Obviously it gets better the closer in the shot.
So where I am getting at with this is I like them but barrel regulation may be an issue?
Ridge Rooster