A friend put a scope on a bone stock M305 (2207 model). Nothing has been changed on it, except it was bedded. he gets 3" with military ball, which is outstanding, because the ammo is not capbale of much more than that.
I have two. Both have a few tune ups on them, including a new spring guide on one. Both shoot so well I smile when I shoot them. Stock iron sights.
But it is luck of the draw. Some guys complain the stock sights are crap. Mine work just fine.
Have seen postings that new ones are better.