i still play halo 2(cant get on xbox much , and most of the times i play with more than 10 people zombies with BRs. i've only played with pistols or shotties very few times. pistols you have to get a headshot or you wont kill in time. shotties, when i played, i shot a guy point blank 3 times and he still killed me. damned lag. anyway, br's are way better for zombies, especially because you can only get 1 hit kills if you are aiming good. plus it makes you conserve your ammo.