Hiya cq and thx for the thread. Good suggestion from the operator about asking the original owner for the sales receipt when purchasing. Its easy enough to request if you also know the store it was purchased at and their name,to get a copy.
I'd suggest a call to cz-usa 1800 955-4486 ,parts is ext 4701, warranty is ext 4706. I'd ask the person answering the phone if you can speak to a cz gunsmith and let that conversation give ya direction. Cheers, be well.