The Arduous Task Of Spawning Items!!!

I have been trying to spawn guns for a while now (I got it to work somehow on the old before 1.0 version) But now when I try something like /spawnitem flamethrower '{"level:"200}' For example it just gives me a generic orange flamethrower with the same stats every time, where as before they were all randomly generated and high damage if I chose a high level.

/spawngun does not work. /spawnsword does not work. Only /spawnitem works for weapons now apparently.

 

I'm pretty sure all /spawn<weapon> commands became deprecated and now you have to spawn them via item names. Randomly generated weapons I believe cant be spawned? though I'm not sure.