An AR-15 stripped lower receiver is an essential component used in building an AR-15 rifle. It is the serialized part of the firearm and considered the firearm itself from a legal standpoint in many countries, including the United States.The stripped lower receiver is the foundation of the AR-15 platform, onto which all other components are attached. It typically consists of a solid piece of aluminum or polymer and includes the trigger group, magazine well, and selector markings. However, it does not include the other parts necessary for a functioning rifle, such as the upper receiver, barrel, stock, and grip.

By purchasing a stripped lower receiver, firearm enthusiasts can legally build their own AR-15 by adding the necessary components or customize their existing rifles. It requires additional parts and assembly, such as an upper receiver, barrel, bolt carrier group, handguard, stock, and other accessories to create a complete and functional AR-15 rifle.

It’s worth noting that firearm laws and regulations can vary between countries and even within different regions, so it’s essential to familiarize yourself with the specific laws and requirements in your jurisdiction when considering building or modifying a firearm.