I've never owned a Wildcat, but from the schematics in the Support section of the FX website it sure looks like the barrel system is much like the Impact. The barrel/shroud assembly is held in place by a grub screw just ahead of the magazine area. Back out the screw a few turns and you can pull the barrel and shroud out the front. No need to separate barrel from shroud. Then you should be able to free the mag and check for any loose pellets that fall into the rifle. Look down the barrel, and if you can't see through it gently push a dowel or cleaning rod down from the muzzle and tap out any lodged pellets. Take a look at the breech (brass) end of the barrel, identify the breech seal O-ring near the end, and with a strong light and maybe a magnifier look to see whether the O-ring is cut or otherwise damaged. If so, The O-Ring Store can have a replacement at your door in 2 days. Otherwise, re-insert the barrel/shroud assembly, make sure it is seated all the way and then tighten the grub screw firmly BUT NOT TOO HARD, and resume shooting.