They were M203 sling adapters before the M4 came along. The "dog bone" will fit either barrel diameter, I believe you need p/n 8448379 for the side where the swivel mounts. Not 100% on the part number, there are definitely 2 different ones though. Numrich used to sell them but it's been a while.
TOS EE has a guy selling 10 - .625 side sling adapters. No affiliation, not a member of the site so I cannot even tell you a user name.
Andy
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