Mt Al,
I took a fall right on my Merkel combo gun bearing the same type of scope some weeks ago. I checked with some shots on the rifle range, everything seems fine.
So thanks god I can only pass on hearsay:
yes, one can knock something loose:
- in the claw mounts, e.g the tiny "hooks" may be bent. Take the scope off, check those hooks, put the scope back on, try to find any wobble when pulling on the scope
- the crosshairs or the mechanism in the scope may be damaged. Fix the gun in sandbags, aim at a target, tap on the scope, look for any movement of the crosshairs. A collimator might help.
Good luck!