An 80 lower receiver is a piece of metal that has been milled to specific dimensions and is then legally allowed to be completed into a firearm by the end user. It is called an “80 lower” because it measures .80 inches in thickness. This receiver can then be used as part of a pistol or rifle build, depending on the type of firearm that you are looking to create.
Natalee Answered question August 28, 2022