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it is a 19mm dovetail here is a weaver adapter to fit https://czcustom.com/cz-parts-all/cz-rifle-rings-and-adaptors/weaver-rail-adapter-cz-550-scope-rail-standard-length-19mm-dovetail-20-moa.html

Jack, it's a - You will need the CZ 550 Standard Action Picatinny Scope Mount here : https://www.amazon.com/Standard-Action-Picatinny-Scope-Mount/dp/B01G97X9V4/ref=pd_lpo_vtph_200_bs_tr_t_1?_encoding=UTF8&psc=1&refRID=S5884CQCCX5S65W5S319&dpID=31yVIU0R%252BKL&preST=_SX300_QL70_&dpSrc=detail19mm Dovetail