I have just found out that my Brno ZKK 602 has the removable front sights. As the one on my rifle is too small to see in the bush ,are there any replacement inserts I can buy so it is easier to see?

CR500 if you can't find any Bob at Kudu services would be able to machine you up some mate, his work is first rate.

I might have to end up doing that. Gabe Gatti is building up my custom gun ,so I might get him to make some spare front sights to suit the factory gun as well, then get the custom barrel made to fit them as well.