CZ(R) CZ 557 magazine is designed for compatible CZ 557 rifles chambered in 6.5 Creedmoor .308 Winchester and .243 Winchester. The detachable magazine provides a 4-round capacity and features steel construction with a blued finish. It provides a factory replacement or additional magazine option for compatible CZ 557 rifles.Key Features Designed for compatible CZ 557 rifles Compatible with 6.5 Creedmoor .308 Winchester and .243 Winchester ammunition 4-round capacity Steel magazine construction Detachable magazine design Blued finishCZ(R) provides firearms components and factory accessories for sporting recreational and professional applications. The company offers accessories engineered for compatibility with supported firearm platforms. CZ products emphasize functional design durable construction and consistent manufacturing standards.