Swamphippy - it's true - some scopes that would fit an ordinary Rapid will not fit an MFR without risers. I have a Bushnell Legend with a 40mm objective and P/A ring and that just clears. If you don't have P/A then you might get away with a 42mm objective. It's one of the lesser known downsides of the MFR unless you happen to prefer high mounts.

Lionel