It's always a question--though sometimes overplayed--whether a civilian .223 Remington firearm can safely fire military 5.56mm ammo.
The CZ 527 series will indeed do so, making it a legitimate if very minimalist 5.56mm option for the American 2A civilian Militia practitioner.
Carbine version: CZ 527 Carbine | CZ-USA
For US-based customers, our .223s will happily eat 5.56, since CIP doesn’t differentiate between the two cartridges and just has the higher pressure as its standard. So our .223s will shoot everything from the cheapest Russian steel to match .223 brass ammo.
ujj
TDF INDEX: Cats, Guns, and National Security: THE DAILY FUDD index. https://catsgunsandnationalsecurity.blogspot.com/2021/03/the-daily-fudd-index.html