[H] call of duty mw1, mw2, mw3, waw, blackops [ W] Offers tf2 keys

only mw2 , mw3 , black ops 1 & 2 activate in steam from retial shops cod4 and cod5 waw and older cod1, cod uo , cod2 u can buy them only from steam store to get them on steam...Activision start add cod series to steam after cod mw 1 (cod4) and then you must have steam to play it older cod games are DRM-FREE.

here is link to forum : http://forums.steampowered.com/forums/showthread.php?t=2795555

and official Retail / Digital CD Keys which steam acc : https://support.steampowered.com/kb_article.php?ref=7480-wusf-3601

"Call of Duty 4: Modern Warfare is not accepted on Steam"