4th nazi zombies map best guns to upgrade

All right now the best gun 4 nazi zombies are 1st the MG/barracoda. Its a big gun shoots faster than the browning. And its a bamf duuhhh. 2nd the ray gun, upgrade it though. and after a dog round u get max amo! These weapons ROCK my friend and I got to level 35; with these weapons and stay were the mystery box is up on the cat walk. put bouncing bettys in the back of you and you will last 4 ALONG time.