I got this rifle for a good deal from a friend but I'm not really an assault rifle kind of guy. The rifle has only been fired 20 rounds and still looks brand new. It is chambered for 5.56mm. So, you can shoot either 5.56mm NATO or .223 Remington. The weapon is made by palmetto state armory. They probably make one of the best if not the best AR 15's around. If you haven't tried one then you should. There is a collapsible stock and 16" barrel. If you have any questions or if you want more pictures just let me know. Price maybe negotiable. Shipping included.