RPK-74M unavailable to use in Hardcore

Self described title.  I play Hardcore.  I want Light Machine Guns.  I pay $100.  I no have Light Machine Gun.

I open Softcore match to test my theory: Yes, can use RPK-74M.  Me no likey Softcore.

Me want RPK-74M in Hardcore.

Thank you.

(Pictures attached.  Trust me that I was able to use the RPK-74M in Softcore.  You can trust a positive.  Pictures prove the negative in Hardcore [Conquest].)