Breaking news, IW got another weapon wrong, the MG36 is actually the G36KV (which is an assault rifle, or even a carbine, not sure).
<!-- m --><a class="postlink" href="http://www.imfdb.org/wiki/Call_of_Duty:_Modern_Warfare_3#Heckler_.26_Koch_G36KV">http://www.imfdb.org/wiki/Call_of_Duty: ... Koch_G36KV</a><!-- m -->
The barrel is longer than the 'KV'
IW got it right, its just got the carry handle/rail instead of the carry handle/sight -> these are interchangeable as its a modular weapons system.
The KV is just the name for the export version of the G36K (karbine) which is used by the Latvian army for example. (see, they just added a V to the name ;) )
H&K/german army obviously don't want their sight/scope being used by outsiders.
Yeah I noticed the longer barrel as well actually, but the heatshields plus/and the distance between the heatshields and the magazine looks like it's the G36K, it's too short for an MG36 IMO, the heatshiels also have (only) 4 openings.
Compare this <!-- m --><a class="postlink" href="http://home.comcast.net/~chenc544/pwpimages/Ares_MG36_04.jpg">http://home.comcast.net/~chenc544/pwpim ... G36_04.jpg</a><!-- m --> to the image of the MW3 MG36 <!-- m --><a class="postlink" href="http://www.imfdb.org/w/images/thumb/e/e9/MW3-G36KV.jpg/600px-MW3-G36KV.jpg">http://www.imfdb.org/w/images/thumb/e/e ... -G36KV.jpg</a><!-- m -->