Here's what my CZ858 looks like with the dust cover installed and a Bushnell Trophy XLT 3-9 on it using Leupold PRW high rings. The dust cover mounts very solidly using the two bolts either side. Only down side is you have to undo the two bolts for cleaning. upside is, you never touch the scope or the scope mounts , just take the entire cover with scope attached off the gun.
It looks like the actual cover is as close to identical as I can see, going from mine to the Zahal website. Only realy difference I can gather is the Zahal has the springs installed, the one from Corwin does not. It took me a few minutes and some sore fingers to get the big spring on, but got it in the end. The good news is the one from Corwin is priced quite a bit less than the Zahal, and the price difference is not worth it for just the springs being mounted. I also like the idea of suporting a Canadian Company (although I have no clue where the machining is actually done, at least Corwin is in Canada
I used the high rings as I really wanted a decent mag scope on it, and to be able to pull the bolt handle back, I needed the extra room. Somewhere I know there is a left side bolt handle kit, just haven't looked yet. At least that would allow me to put some kind of brass deflector on the RHS. For now, I taped up the scope (few layers of duct tape - homage to Red Green - with some electrical tape over that and some velcro to help protect.
Taking it to the range to see how it all works tomorrow, will let y'all know how it goes.
Here is the gun as it sits now:
Here's a closer view of the cover/scope: