When people mention the “80% lower” they are generally talking about lower receivers. In general, a lower receiver is a part of a firearm that houses the firing mechanism, bolt, and the magazine of the firearm. Today, in order to help you find the best 80% lower for your needs, we’re going to take a look at some of the most popular ones on the market. We’re also going to show you a few things you should pay special attention to. Without a further ado, let’s jump straight into the review.