The fourth weapon slot is unlocked in the Action Hero mode. I think you have to beat the DLC once to unlock the other modes.https://imgur.com/IXLBdMB
Type: Posts; User: Quad_Awesome; Keyword(s):
The fourth weapon slot is unlocked in the Action Hero mode. I think you have to beat the DLC once to unlock the other modes.https://imgur.com/IXLBdMB