I don't know how to repeat it again. Basically I had an m16 acog with c4! haha..
I died using the g3/c4 on the assault class. Then right after the kill cam i brought up the class selection menu to change my gun, before i could finish my selection, i got revived. And the class section screen was still there while im alive, but i cant move my player or get out of that screen. I can still maneuver through the menu, and so suicide was my only option. So when I respawned with the m16 acog, when i went to switch to the grenade launcher, i got c4 instead.
I took out my cell and recorded me using the c4 and m16 for about a minute, ill post it later.