Convenient kit of genuine Colt factory parts includes all the small parts needed to finish a small-pin AR-15 lower receiver, and install the trigger group and pistol grip of your choice. Or, use the kit to rebuild the worn internals of an old rifle and restore it to like-new function and reliability. The single-manufacturer source-the company that developed the original AR-15/M16 platform and built them for the U.S. military-means the kit parts are designed to work together and will require minimal fittingFeatures :Includes Accu-WedgeFits Small Pin Mil-Spec AR-15 Style Lower ReceiversDoes Not Include Trigger, Hammer, Disconnector or Pistol Grip