 The Armory M1A1 the semi-auto civilian legal version of the M14 It is chambered in 762 by 51 NATO also known as 308 Winchester. It is Good out to about 1200 yards at the local range here. We can go out to 600 It has a vortex scope on it right now mounted that has a 1 to 4 power So 1200 yards is a little tough with this one, but 600 yards is no problem at all