New FX wildcat compact will not cock

Sounds like one of the pellets have backed out a little in the magazine and is preventing the magazine from rotating. Happens to mine occasionally when shooting JSB Heavies. You might try cocking it again and when the side lever is back pull the magazine out. It’ll be hard and it’ll ruin the pellet that is doing the hanging. Hopefully that’s all it is and if it is for future prevention be sure and really push the pellets well below the surface of the magazine. Good luck and keep us updated.
jk
 
Sounds like the barrel is not positioned correctly. 

Underneath the forward cheek piece (small one) are two set screws. Remove the cheek piece and the second set screw. With a flashlight, locate the indentation in the barrel where the set screw should be. You may need to rotate the barrel a little to find it. Put the screw back in place (not too tight) and rotate the magazine. Once it rotates correctly, tighten down the set screw and you should be good to go.