I dont know but you would think it would be chambered in a Nato round wouldn't you?
i like 7.62x39
The 805 Bren is CZ’s answer to the need for a modular and reliable piston-operated selective-fire rifle. It is specifically built to switch between calibers and even magazine systems easily. Removing the barrel/piston system only involves 6 easily-accessible screws. Change the bolt-face and the rifle can shoot a range of different cartridges (5.56Ã45 and 7.62Ã39 are currently on contract and many more are possible).