You can mount a red dot on your Brno Combo with the JK-N Picatinny rail made for it. The rail is steel, made in the Czech Republic, with screws included. Once it is on, you can use any red dot with a Picatinny mount. Tighten the screws to 2 to 2.5 Nm.
Red dots with a Picatinny base are in Red dots with Picatinny base. Rails for other CZ rifles are in Picatinny rails.
Yes. JK-N makes it for mounting a red dot on the Brno Combo.
Just know that the prices may be considerably higher since the company is shipping from the Czech Republic. However, shipping is quick from order placement to shipment and considering that the parts traveled around the globe, it was surprisingly quick. US tariffs were included in the price so I didn't have any surprise duties to pay coming into the US.
Service and communication were great, all of my questions were answered quickly and thoroughly. I would definitely purchase from CZ Parts again.