Wrong forum board for this question, but expect the 500 to beat every optic and mounting system to death.
It's not a question of if, it's when, followed by "is regular replacement acceptable to you?"
Try this area:
S&W Revolvers: 1980 to the Present
The archives are great: Recommended Red Dot or optics on a S&W 500
There might be newer products on the market after this older thread.
I would call the manufacturer and try to
get a written warranty for that blaster.