i dont know the names of weaopons BUT
I would use
A large clip machine gun with long barrel and scope with automatic and single burst capabilitys grenade fireing capabilitys to break up clusters
A shotgun with long barrel for accuracy long range shots
A lightweight handgun with large clip...holds lots of bullets...all bulets would be armor piercing in case they are behind car doors or walls
2 ft katana blade cause when you run out of ammo and they get close you want to be deadly and efficient
and who really wants to spray infected blood around with a chainsaw
the key is to pierce the brain or remove the head not make a big bloody mess...... be a gentlmen about kiling zombies