I built an AR-15 and thought I would use it. It just sits in my closet. The AR is chambered in 556 NATO. It has a PSA upper and lower. The lower has the option for burst mode if you add that type of trigger. I have polished the trigger so it has a really nice feel when firing. The reset is really short. It has a Magpul grip and flip up sights. The stock is a Strike Industries adjustable stock. Case included. Asking $600 OBO. first come first serve. No holds. Test me at 36O-Six zero nine 7660 if interested.