Kirk from Aero Precision reviews the components you will need for building out your AR15 Stripped Lower Receiver to complete your lower receiver assembly. Components reviewed include the lower receiver, lower parts kit, buffer kit, stock/brace and magazine.
When building an AR15 Lower Receiver, the first thing you will need is a stripped lower receiver. This is the registered part of the AR15 so it will need to be transferred or purchased through an FFL Dealer. The lower receiver is the portion that contains the fire control group, magazine, and buffer assembly. We offer two variants of AR15 lower receivers, the M4E1 and the X15/AR15 Gen 2. Both are compatible with mil-spec components.
The lower parts kit includes the smaller components needed to complete your stripped lower receiver, such as pins, springs and detents. We offer several options as complete lower parts kits which include a fire control group (trigger) and grip. If you want to use an upgraded trigger, pistol grip, or trigger guard you can buy the lower parts kit without these components included. We also have specific M4E1 Lower Parts Kits that do not contain a trigger guard as the M4E1 Stripped Lower Receiver features an integrated trigger guard.
The buffer kit attaches to the rear of the lower receiver and contains a buffer tube, buffer, buffer spring, castle nut, and endplate. You will need an AR15 Buffer Kit that will accommodate whichever stock you choose for the build. Most standard AR15 builds using a collapsible stock will use a carbine buffer kit. We also offer rifle buffer kits for use with fixed stocks and pistol buffer kits for use with arm braces.
Choose a stock or arm brace to complete your lower build. Your stock or brace will install over your buffer tube. Please ensure you are in compliance with all local and federal laws when selecting either a stock or arm brace.
The magazine is the component of the AR15 that holds your ammunition. Please ensure you have the appropriate magazine for whichever caliber you choose to build (5.56 NATO, .223 Rem, and .223 Wylde all utilize the same magazine).
Once you get the parts you need, you are ready to start building! If you are uncomfortable with the building process you can always take your components to a local gunsmith or armorer to have your lower receiver assembled. We do also offer complete AR15 lower receiverson our website if you prefer to purchase as an assembly.