now,now,don't get pissy.The first time I opened my mp5s gearbox I thought the same thing.Yes they're not in english but LOOK AT THE PICTURES CAREFULLY.You can see which way the parts go in,what goes in first,etc.The hardest part is the spring...it wants to pop out when you put it back in,then it causes everything else to move on you.Put the spring into the piston last,after everything else is lined up.Push it in with the spring guide,stick a screwdriver in the end of the guide and push down on it.This will hold it in place and it won't pop out as you try to put the cover back on.Place the cover on while still applying pressure with the screwdriver...keep pressing down until the cover is back on with a few screws in.Once you got them in your home free.I FULLY upgraded my gun,the first time I took it apart.Ive never worked on a airsoft gun before that.C'mon MARINE,YOU CAN DO THIS!Hope I helped you out.