I have contemplated adding a red dot sight to my M17. People I have known who have red dot sights tell me they are hard to zero. Did you experience this?
I think I read that the M17 was designed for a priority Leupold red dot sight.
I didn't have a hard time with the zero. A few adjustments and I was right on target, red dot just over the front site.
Rangemaster at spring guns & ammo come over and asked me to slow down my rate of fire. Wanted to argue cuz I was hitting my target every time in a decent group, but didn't.