When do we pick up new guns?

#1Temp89Posted 2/20/2013 7:04:37 AM
I keep getting rank ups that tell me I've unlocked a new weapon but I'm still stuck with the Pulse Rifle. Do we get to use the SMG or tac shotgun in the campaign or are they multiplayer only?
#2trob32Posted 2/20/2013 10:53:24 AM
I know you can press B and switch out weapons for each weapon slot, have you tried that?