Awesome 80% Lowers and Jigs
Although there are numerous producers of 80% lowers and proprietary jibs on the market, I found 80% Arms to be the best. Their lowers accept all mil-spec parts and come in a dull, black anodized finish which I prefer over others that use an epoxy, shiny finish. Furthermore, the jigs have a lot of thought put into them, the most attractive feature being the requirement of only one starting pilot hole before beginning routing operations.