The AR-15 lower receiver is the foundation of your entire build — and the only part legally considered the “firearm” by the ATF. Whether you’re building a dedicated AR9 9mm pistol, a versatile 5.56 carbine, or a custom competition rifle, choosing the right AR-15 lower matters more than most shooters realize. With AR9 9mm and AR10 searches trending strong, many builders start with a quality AR-15 lower and then decide which upper to pair it with. At Zaviar Firearms, we off …

he AR-15 is one of the most popular and customizable rifles in American history — and for good reason. Its modular design means no two builds have to be alike. Whether you're building a precision long-range rifle, a home defense carbine, or a competition-ready flat shooter, the AR-15 platform can be configured to meet your exact needs. But why should you bother with a custom build when you can walk into a store and pick one up off the rack? The answer is simple: off-the-shelf rifles a …