It's kinda odd, The cocking mech is working fine but, When i cock it back the spring is completely like wedged and won't move. It won't take any bbs or fire for that matter, it's really hard to show a picture. I don't want to open the gun because I won't be able to send it back because of the warranty.
Unless King Arms has done something magical (which usually these things are just Marui clones so..) the charging handle is completely nonfunctional.
It's also NOT a V.2/3 gearbox if it's a Marui clone, I think it's 6 or 8. Whatever Marui used in the M14 IIRC, it's been a while.
The important thing is, does the gearbox cycle? Don't worry about firing or anything coming out of the barrel, what happens when you pull the trigger?
Did a bit of research and the gun does appear to be a Marui clone with a version 6 gearbox. This does mean it's not compatible with V.2/3 parts (not that all v.2/3 parts are compatible with each other anyway, there's just a fair amount of crossover between them and they're the most widely used gearboxes), but this design has been around for a while now so it's not like parts aren't widely available.
Also, by knowing how something works it's usually easier to figure out where problems may be arising. This is my experience, at least. This is a generic illustration of an AEG gearbox/firing mechanism. They all work the same way, just with different geometries/layouts; this is a V.2 box