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Yes, they are.

Hi Glen, Yes they are. Warne 1" Permanently Attached CZ 550 19mm Dovetail High Rifle Scope Rings

Warne 1" PA CZ 550 19mm Dovetail Scope Rings High are designed to be the strongest, most durable Fixed Scope Rings system available. Typical steel Mounting Rings in this class use only 2 screws per ring, have a narrower clamping band and in most cases only absorb recoil in the front ring. Maxima PA Mount rings utilize 4 T-15 Torx style socket cap screws for secure Rifle Scope optics mounting. The Maxima Permanently Attached series fit Weaver style cross slot bases and incorporate a Warne square stainless steel recoil control key in both the front and rear Scope Base rings. This ensures a "no slip" positive recoil surface across the entire slot of the Mounting Base and is capable of withstanding the heaviest of recoil. The Warne Maxima square recoil key also protects against swaging or peening of the base when used on softer or less durable materials. The Maxima PA rings band width is also substantially wider which offers more ring to scope clamping area to hold the Rifle Scope optics f

These 1" inch rings are a designed to fit the CZ550's 19mm Dovetail Scope grooves.

1 inch rings and will fit the CZ %%0 just fine

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