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William, this barrel should fit the "CZ 455 Standard" fine. I would still confirm this directly with CZ-USA at Toll-free: 1-800-955-4486 or Phone: (913) 321-1811 EXT: 4704 ---- Representatives available Mon-Fri 9am-4pm Central

William, This is a replacement barrel, magazine and tools for 17 HMR caliber. If your standard is 22lr I would not use this barrel.