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This is a complete list (27 Parts) of everything you need to build an AR-15 rifle. Underneath each component is a list of suggested products the Guns Inc. experts use or have used in the past on AR-15 builds. There are many different ways to configure an AR-15, from AS9100D Certified and ITAR Registered shops machining custom competition, match-grade lowers to mass-produced cheap polymer lowers. Each AR-15 build is going to vary, depending on your reason for building the rifle. It might be a 9mm carbine, long-range precision (DMR or SPR) or simply just a fun firearm, this guide will get you started and we'll do our best to lead you in the right direction.
The "Stripped Lower Receiver" is the serial numbered part of the firearm. Buying the lower receiver works the exact same way as buying a completed firearm. AR-15 stripped lower receivers must ship to an FFL dealer. You will have to pass the federal background check before taking possession of a stripped lower.
To assemble the AR-15 stripped lower, you will need 31 different parts, including the trigger, bolt catch, springs, pivot and takedown down pins, selector switch and hammer. The most convenient way to get all of these parts is by purchasing a full AR-15 Lower Parts Kit.
The kits include all 31 items, including a pistol grip and trigger. However, some items you will probably want to discard from the pre-packaged kit and purchase as separate upgrades.
Located behind the trigger guard and at the back of the rifle is the "Pistol Grip". You grasp this with one hand to aid in shooting the rifle. A basic pistol grip is usually included in the lower parts kit, but many find aftermarket grips fit their hand better.