How to take 3 guns?[ Heat Project ]

if you are in 上尉
my account is 少尉
it is sort to 10 階
少尉＝1 main gun and 2 spare guns
中尉=2 main gun and 2 spare guns
上尉=3 main gun and 2 spare guns

YOU CAN ALSO USE BUG. BUT PEOPLE WILL KICK YOU AND THEY MIGHT BLOCK YOUR ACCOUNT. I HAVE EXPERIENCED THIS BEFORE.