Abner is correct, the CZ guns in question were made by Montana Rifle Company.
Regarding Sodbusters question about quality, I have no first hand knowledge. I do know Wayne at Oregunsmithing builds customs off of Montana actions, and other than being heavy guns (he specializes in lightweight Remington customs) he has no complaints. They are cast receivers, using the same process Ruger uses or so I'm told.
CZ need to get a clue and make a nice hunter off their 550 action in all stainless steel with a decent glass stock like a McMillan. With Winchester done for, they'd have no competition for true controlled round feed in a quality gun.
RR