RE: Omega ?
I have the Z5. Sabotloader is correct in that the trigger assembly cannot be disassembled. It also comes in only one model - blued barrel and black synthetic stock. Same Green Mountin barrel.
I love mine. This is the second season with the rifle and it has accounted for 5 deer. I shot a doe yesterdan at 143 yards with the Speer Gold Dot 300 gr bullet and 115 gr. of loose Triple 7.
Stainless is overrated for me because I am anal about cleaning the gun after every hunting shot or range session. I mounted a Nikon Buckmasters 3X9 scope on the "one piece" Talley base/rings and the gun shoots great with this combination. If your barrel is tight like mine get some HPH-24 sabots from Modern Muzzleloading Products (MMP) and loading is a lot easier.
You made a great choice.