Let me put it this way: I ONLY play Classic mode and maybe played on average 6 hours a week. So Classic mode's been out for about 6 months and I got Eddy's AK last month. 5 months x 24 hours a month = 120 hours.
I wasn't even trying to get Eddy's AK, in fact, I figured I played Classic mode so much and for so many months that I had every item from Classic mode. When I got the Jade Lion and then unlocked Eddy's AK, I was SHOCKED.
This treasure is a strange treasure. Some people have a horrible time getting it and some earn it really easily. I had no problem with this set, I believe I got it while hunting for Talbot's Fal (Hardcore days).
The only thing I didn't get in HC is Roman's GMAL. Then again I was playing HC, and his gun looked like crap.
I earned just Eddy's AK and Talbot's Fal from playing Hardcore, Roman's G-Mal is useless.
I got Marlowe's Para in HC as well. Honestly even though I play HC I still put them on my loadout. Why? Simple: shiny.
I got Marlow's Para from Classic. I never really cared for Hardcore until only a few weeks from when they removed it, was great fun.
I have all the HC guns now. I never liked Roman's G-MAL, because I'm not a a G-MAL user, and also because, like Stunt said, it doesn't look very good. I just got it while I was trying to unlock Eddy's AK. Eddy's AK and Marlowe's Para 9 were the biggest pains in the **bleep**... Just keep at it and you'll get it eventually.