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I personally have no experience with the 527 but have some with several 452's.One of my favorite rifles is a 452 FS(full stock) in 22LR.When I bought it I noticed that when I turned the bolt handle down or up to unlock or lock action it was rather rough.I polished up the rear locking lug and this made it butter smooth.A friends 452 in .22 mag had some problems cycling certain brands of ammo.We never diagnosed the problem because he said he didn't care because the two brands it cycled flawlessly also shot tiny little groups.I would not hesitate to buy another CZ because mine is far nicer looking and better shooting than any other 369 dollar rimfire I have ever shot.I do wish that CZ would put better looking checkering on their rifles and charge a few extra bucks.