Whether you’re a first-time AR-15 builder or a seasoned pro, this post is for you! This guide will help you through the process, including photos to reference. The biggest advantage of buying and building a kit like this is that it doesn’t actually contain the “firearm”, which in this case is a stripped lower receiver. That means it can ship directly to your house without messing with background checks, waiting periods, and other nonsense. This kit doesn’t come with an upper receiver, charging handle, or complete bolt carrier group. Those are all parts of the AR upper receiver and are usually not sold in lower parts kits like this one.