Youre actually switching out classes when you pick up a kit, not just your primary weapon.
Had a great run this morning. Won all the rounds I played and was apart of the top squad every time except once and even captured top player once while defending. Had a guy on my team that would just C4 the objective building and take the whole thing gown in one go. He was probably the same guy that was putting C4 on the trees and blowing them as people walked by. Great time.
Also, I killed someone with the defibrilator(sp?). Hilarious.