We hi capa 5.2k screw on adaptor

[Kirbymeister]

I've got a we hi capa 5.2k and am looking to fit a screw on compensator. looking at the end of the outer barrel it looks like it's threaded already so I was wondering would a compensator/suppressor just screw straight on or would I need to buy one of the screw type adaptors? I've tried looking over the net but can't seem to find much.
Cheers