AR308 VS AR10
The AR-308 and the AR-10 are two separate and distinct rifles. There is no US mil-spec on either, as neither were ever adopted in a widespread manner by the U.S. military. When you are shopping for parts for your AR-308, make sure they are based on the DPMS Generation 1 pattern, as this is what our AR-308 80% lowers are based on. The DPMS Generation 2 and Armalite AR-10 upper receivers will not match up with our lower receivers.
If you have additional questions about parts compatibility on the AR-308 platform, feel free to either email us at firstname.lastname@example.org or call in at 512-584-8013 (Option 1 for Sales).