I have the same sights. I got lucky and they work perfect with the factory fiber optic front sight.I have a 527 youth model with an NECG rear sight. Feeds steel case with no problems. Light and accurate.
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NECG CZ 527 Ghost Ring N-104, Peep Sights | New England Custom Gun Service, Ltd.
www.newenglandcustomgun.com
I liked the NECG sights much more than the Skinner sights, even though they were $40 more.I have the same sights. I got lucky and they work perfect with the factory fiber optic front sight.