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YES, CZ USA said YES it is fine to shot 5.56 NATO and . 223 MATCH ammo in the CZ 527. CZ rifles are built to CIP spec, which doesn't differentiate between . 223 and 5.56, it uses the higher pressure of the two and considers them one cartridge. I hope this helps!

Yup, the 527 is one of a few rifles chambered in .223 that you can shoot 5.56 out of safely.

Yes sir. You are smart to ask first! Stay safe and happy plinking!

Larry, for warranty and safety reasons, I would confirm this with CZ USA Customer Service at Toll Free: 1-800-955-4486 - Phone: (913) 321-1811 Extension : 4701