RSR Group, Inc. Exclusive: RSR Group, Inc. is pleased to be the Exclusive Distributor for Advantage Arms products. Advantage Arms specializes in Glock conversion kits, allowing users to change their standard 9MM, 40 S&W or 45ACP pistol into a 22LR. For a complete listing of Advantage Arms products found exclusively at RSR Group, Inc., check the Online Catalog section of the RSR Group, Inc. dealer Web site.