On my 522, the front sling post has a loop ring for an hk clip. The rear post is the "normal" type, which is big enough for a qd connector. While I can (and did) clip my other hk clip to this swivel, I would much prefer it to be round, rather than elongated for a strap. I'm not familiar with the options. Should I be looking for a different post, or swivel? I can't find either, at this point. Any suggestions would be appreciated.