Aero Precision M4E1 and Palmetto State Armory are widely recommended for AR-15 builds. Cross Machine Tool and BCM also earn strong marks. Prices typically range $99–$431 depending on features and finish.

Are 80% lower receivers illegal?

Federal law doesn't classify 80% lowers as firearms, so they generally don't require serial numbers or background checks. However, the ATF's 2022 rule was not fully struck down — the Supreme Court's VanDerStok v. Garland decision addressed ATF authority but left parts of the rule intact. Check your local laws before purchasing.

What is the purpose of a lower receiver?

A lower receiver houses the trigger assembly, hammer, and sear—the fire control group that makes a rifle function. It's the serialized part legally classified as the firearm itself. The lower also anchors the stock and buffer tube, serving as the structural backbone for AR-platform builds.

Why are lower receivers out of stock?

Stock levels fluctuate with demand and production capacity. Our marketplace currently shows 1 of 2 variants in stock across 12 retailers. Even common budget brands like Anderson and Aero Precision face shortages, with many distributors running low. Check multiple retailers frequently for current inventory.