Hey I'm not the guy who got 6s but i got 7s, my technique was jumping with your shotgun then killing the guy with the grenade gun, he will be closest to the walk way. Then quickly throw your gun and grab his and then you have to grenade jump to the end. You will need to understand how to air strafe so you can stop yourself. I wouldn't recommend trying to kill the guard on the end island he rarely hits you so long as you crouch before getting to the island.
Jk ignore all that i just beat my record by jumping then shooting the barrel with the shotgun then landing on the milk. its easier and way faster.
