My Friend just bought the Evanix Rex carbine, not the short pistol one, but the longer carbine model.
To be kind but honest I would never recommend anyone buying it, it is: 1 loud, very very loud. 2 terribly innacurate with all 5 types of pellets we tried, 3 it is not possible to mount a bi-pod. 4 It is hard to get pellets into the tray. and 4 it is not really cheap, a Marauder would be a much better option in my opinion, oh and 5 the trigger was absolutely HORRIBLE! I would guess it had a 15-16 pound trigger, no doubt the worst I have ever seen.
This is my honest opinion on the rex, sorry Evanix but that one was a mistake, one a scale of 1-10 I would give this gun a 2.