This is slightly embarassing. I'm halfway through the campaign, and I haven't worked out how to use the underslung grenade launcher on a rifle. I'm pretty sure it's there, but I've tried every combination of buttons, played around with the inventory, checked the manual and searched on Google, and there's nothing. I'm on Xbox, but if anyone can tell me the PS3 version's controls, I could probably work it out from that.
Thanks in advance
EDIT: Don't bother, I figured it out.
Thanks in advance
EDIT: Don't bother, I figured it out.