Grenade Launcher - I may as well be chucking pies at them for all the good it does. Tried splash damage, shooting them in the face with it, full body impact. They just shrug it off and then have a free spray at me while the thing's reloading (and yes I'm using the rail).
BC1 & 2 I racked up pleeeeenty with it but I doubt I'll get anywhere near me 20 kills for the SCAR without pleeeeenty of pain.
What's the secret? I'm sick of baking pies.