RSR Group, Inc. Exclusive: RSR Group, Inc. is now the Exclusive Commercial Distributor for Knight's Armament products. Knight's Armament manufactures the legendary Stoner Rifles, a line of rifles that stands as one of the most technologically advanced on the market. Knight's Armament products are renowned for their innovative, cutting-edge features for the tactical shooter. The SR-15 and SR-25 model rifles will be immediately and exclusively available for the commercial market through RSR Group, Inc.