This is a NIB Steyr AUG 223rem 16" with rail.
It is a gas-operated semi automatic sporting rifle with a changeable barrel and a picatinny rail (Mil. Std. 1913 rail) which allows quick attachment of various optic devices.
The rifle comes standard with two 30 round magazines, soft carry case, Factory AUG sling, and cleaning kit that fits conveniently in the butt stock