Hello and I am so sorry no one responded to your question including my self. There is/are a number of reason it could have happened the way it did, in my case my Father-In-Law has been very ill and I have been busy running (ok driving) back and forth between here and Sarasota.
Presuming you are actually still a member here I Welcome you to our forum, and again apologize for the tardiness. As it happens I am in no way knowledgeable regarding long guns. I have a couple, but I got them to learn how to shoot them as part of my "Bucket List" as I am more comfortable using and teaching how to use and breach doors and structures, with small arms, MP5's and or 18" barreled Winchester model 12, 12 Ga. shotguns.
If you haven't already done so I would suggest that you contact the gunsmith's at CZ-USA with this question or ask GM, Our local personal contact with CZCustom for his advise regarding your weapon.