At Moriarti Armaments, you can choose from a variety of 9mm AR upper options, including complete upper receivers or customizable kits, so you can build your rifle exactly the way you want it. At Moriarti Armaments, you can choose from a variety of 9mm AR upper options, including complete upper receivers or customizable kits, so you can build your rifle exactly the way you want it. At Moriarti Armaments, you can choose from a variety of 9mm AR upper options, including complete upper receivers or customizable kits, so you can build your rifle exactly the way you want it. At Moriarti Armaments, you can choose from a variety of 9mm AR upper options, including complete upper receivers or customizable kits, so you can build your rifle exactly the way you want it.