Not a chance (would be nice!) the rear sight would have the 2400 yd range and the barrel date is too late
I still am interested to know if the sear with the bottom hole is correct or not - a few years ago I bought a Rock Island at an estate sale, it was in the 64xxx serial range also with a RIA barrel dated 3-07 with the open bottom rear sight base. The sear on the Rock Island also had the bottom hole too.