The TacFire AR-15 complete build kit is the easiest option to quickly allow you to complete that lower receiver that you have been sitting on. The build kit comes with all the small assembly parts including a complete lower parts kit, pistol buffer tube kit, and upper receiver kit. With just a few simple tools and some spare time you too can build your rifle and take satisfaction knowing that you built your AR-15. So trust TacFire to get your build started off on the right foot.