The Br3 lower is a more traditional rifle version of our Mk3 platform that is designed to use Remington 870 compatible stocks, and DISSENT Mk3 upper groups.Those looking for a large frame semi-auto alternative for hunting and medium to long-range shooting have a platform to build off of with caliber options ranging from tried and true performers like .308 WIN and 6.5 Creedmoor along with a new favorite, 8.6 BLK.Included are the cross-bolt safety and MagpulSGA870 pattern stock.NOTE: Br3 lowers are only designed for use with DISSENT Mk3 Upper Groups.