Letter Re: Advances in 80% AR Lower Receiver Technology
James, There have been some interesting developments in the world of 80% complete AR lowers. The following are some companies that are producing beefed up AR-15 carbon fiber or polymer lowers that can be completed more easily than their older generation aluminum relatives: EP Lowers JMT Polymer 80 Another innovation is a jig that allows a hand router to be used to mill out the control pocket of an AR-15 80% aluminum lower. As many of your readers already know, the lower receiver is the part with a serial number that the BATF considers a “firearm.” However, an 80% lower …