The Adams Arms .223/5.56 Carbine-Length Upper 11.5" Tactical Elite is a short barreled upper that incorporates the patented Adams Arms technology and the Samson extended free floating forearm. The piston system parts and the barrel have been treated with our salt nitride Meloniting process making them harder and more corrosive resistant than hard chrome. The free floating quad rail was manufactured for us by Samson Manufacturing and is a 10" rail that extends along the sides and bottom of the gas block, giving you enough space to mount the removeable picatinny rail pieces to meet any of your needs. Add the patented Adams Arms piston system and you'll have an upper that will run cleaner, cooler, and longer than any other AR upper you own. All NFA rules apply