I currently have the MS3 sling system. On the forward sling attachment I have the MSA made by Magpul, and on the buttstock I have a qd swivel attachment. Ironically the MSA will attach to the forend of the CDI free float forend without any modification. It works for me and doesn't cost as much as purchasing a rail, and a rail sling attachment. IMO I think my creation looks pretty good and it costs a few bucks less!