Browse our full selection of AR 15 upper assemblies below to find the right parts and additions for your gun or rifle. We stock AR 15 complete upper parts including a wide variety of spring pins, rear sight assemblies and much more. Our AR 15 upper receiver category includes a wide variety of essential components made in the U.S from top quality materials and includes name-brand pieces from top manufacturer such as the Vitor complete upper receiver. All of the products in this category are mil-spec upper parts made for us with flat top, A3 and A1 upper receivers. Feel free to contact us with any questions!