Whether you’re looking to start, finish, or upgrade your AR build for different applications, Guns.com has you covered. We’re proud to now offer a variety of premium quality upper & lower receivers at an affordable cost and convenient online shopping experience.
Find popular AR 15 parts from brands including Yankee Hill Machine, Bushmaster, Aero Precision, Spikes Tactical, Bravo Company Manufacturing (BCM), Anderson Manufacturing, Patriot Ordnance Factory (POF), and more. Uppers ship directly to your home or business, while lowers will go to your local FFL for pickup.
AR-15’s are traditionally broken down into two large categories, upper receivers and lower receivers.
The upper receiver consists of the barrel, gas tube, handguard, BCG (bolt carrier group), charging handle, upper receiver, and more.
The lower receiver consists of the buffer tube, buffer spring and buffer, stock, trigger assembly/pack, pistol grip, lower receiver, safety/selector, and more.
While there many more components found in an Armalite pattern firearm such as springs and detents, these are the main ones that are upgraded/needed for a build.
The upper receiver houses the bolt carrier group and charging handle. You can legally purchase both complete and incomplete upper receivers.
The incomplete option being bare bones, and not including components like the bolt carrier group and charging handle.
Some complete upper receivers include a barrel, muzzle device, handguard, and potentially more in addition to your bolt carrier group and charging handle.
The lower receiver is a serialized frame that houses the firing control unit. Lower receivers are available to purchase in both complete and incomplete form.
A complete lower receiver may include a trigger, safety assembly, magazine assembly, and sometimes a grip, stock, and buffer tube.