If it is a newer Ruger American it will have the modular mag well with inserts. Ruger has the parts to convert it to AI style.
However, the bolts for the AR and AI magazine guns are notched out on the bottom. Maybe they all are now, not sure.
It is pretty obvious. Either the bolt is smooth and round or it looks like it was fed into a CNC machine operated by a drunk dyslexic.
