What is a lower receiver
The lower receiver sits above the pistol grip, holds the trigger and hammer, and has a slot for the magazine. By itself, it cannot fire a bullet. The approximate amount of money that you need to purchase a lower high-end AR-15 is about $372-$412.
Different Lower Receivers
Can you use them on any AR rifle?
The lower receiver of an AR-15 is a more than a part; it is the single piece that every other part revolves around. Modular rifle design developed to adapt to the changing needs of individual soldiers. Lowers are (supposed to be) universal and the parts that go in and on them are interchangeable.
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