In 2019, it opted to go the retro route with the launch of the 5.56 NATO/.223 Rem. BRN-180 series of factory complete AR-15 uppers inspired by Eugene Stoner's AR-18/180. As a scaled-down version ...

223 Wylde chamber, 1:8 twist rifling ... priced piston driven options currently on the market. Look for the BRN-180 upper listed under product number #078-000-483 on the Brownells website.