I traded into a VZ 2008 a few months ago and just got around to shooting it yesterday. Troubles from the start. Shot 1 round but trigger didnt cock for the next round. Did this several times with both mags. It fires and recoils enough to feed a new round into the chamber but wont cock the trigger. I can charge it by hand and it fires, loads a new cartridge but the trigger doesnt cock. Anyone know how to fix this? Thanks in advance.