I put a SightMark RDO on my S&W Model 22S. The RDO manual says it fits 'Standard dovetail mounts' and the Model 22S manual says it comes with a 'Weaver-Style' mount rail.
Look at the pics below and tell me if it can be used in this configuration.
The RDO is level, and tight, but the tilt in that clamp is bothersome.
Look at the pics below and tell me if it can be used in this configuration.
The RDO is level, and tight, but the tilt in that clamp is bothersome.

