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Close-up of an AR-15 upper and lower receiver separated at the takedown pins

Upper vs Lower Receiver: Key Differences Explained

If you are new to the AR platform, the terms upper receiver and lower receiver can sound more interchangeable than they really are. They connect directly, they are often discussed together, and many buyers first encounter them while comparing complete rifles, stripped parts, or upgrade paths. But they do not do the same job, and…

Black stripped AR-15 lower receiver resting in grass with rolling hills in the background.

Firearms

What Is an AR-15 Lower Receiver?

The AR-15 lower receiver is the bottom half of the rifle's two-part receiver system. It houses the trigger mechanism, supports the magazine and operating controls, and provides attachment points for the pistol grip, buffer system, and stock. Unlike the upper receiver, which supports the barrel and houses the bolt carrier group, the lower receiver contains…