The Cadex Flush Cup Sling Adapter fits the CDX-MC Kraken, CDX-33 Patriot, CDX-300 Freedom, CDX-30 Guardian and CDX-R7 C.O.P.S. rifles and the Dual Strike, Lite Strike, Field Tactical and Field QD chassis. It also fits non-M-LOK generation of CDX-R7 Lite Comp, CDX-R7 Field Comp, CDX-R7 Shepherd & Sheepdog rifles and Lite Competition, Field Competition and Strike Nuke chassis (prior to 2018 models).