Close
I think if you redeem the bundle you get a gift of the game you already have (I did it with HL2 and the HL bundle), but you should ask around to see if that works too with that bundle. I can offer some of these games for GMOD if you can get it as a gift.
Bought CSS+Gmod bundle but I already have gmod and steam won't give me the extra copy so I figured instead of wasting it I would just trade for CSS. Game will be traded over steam