Ok, been doing some research and I think I have most of it figured out myself.
Accura, Optima, and Wolf are (BP only)
The Accura has the same breech open mechanism as the Apex.
The Optima and Wolf open like the Scout.
Optima Elite: is an interchangeable barrel model that I believe they have now replaced with the Apex. The breech open mechanism for the Elite was a lever behind the trigger guard that could pinch you.
Apex: They now have the breech open system that looks a lot like the Encore, the barrels are interchangeable centerfire and BP. It is only available in Stainless.
Scout: Is a centerfire only gun with the breech open mechanism in front of the trigger guard. I believe it can be had with either iron sites or scope base. Stainless or blue.
Hunter: I believe this is the Academy Sports version of the Scout. All of the ones I have seen have the open sites. It is not on the CVA webpage.
Stalker: This is a centerfire only gun. This gun has a breech open lever behind the trigger guard just like the Optima Elite. The barrels even say Optima Elite. I wonder if this is a modified Optima Elite they created to use up their Optima Elite parts since they replaced it with the Apex. I read where someone stated that the Optima Elite barrels wouldn't fit on this gun, but the barrel off of the Stalker would work on the Optima Elite. I guess they modified the receiver and or barrels to prevent interchangeablility. I have only seen the stalker without sites and drilled and tap, no scope base installed. I suspect once the supply runs out, the Stalker will not be available any more and the Hunter or Scout will be the only option.
The Stalker may be an Academy Sports version of a modified Optima Elite. The Stalker is not on the CVA webpage.
Please chime in if you find any errors in my research or opinion or anything to add.
Hopefully this thread will help someone that is considering buying one of these to know exactly what they are getting. When I bought my Stalker a few weeks back, I really had no idea what the options were or what any of the other CVA guns were.
Now the question is, will CVA ever make the Apex in a pistol version to compete with the Encore?
Rosewood.