i am a luckY bas*** and i have won kriss with 1 crates tomsponwith 3 crates winchester with 3 crates m4a1 custom with one crate bereta one crate aug camo 4 crates and deagle camo with 2 crates.but if you are not lucky dont try to play many gp or zp because it would be a waste of money.
MY TIP TO HAVER MORE CHANCES TO WIN A BM WEAPON DONT PLAY MORE FROM 5 AT ONE TIME TO BM. KEEP YOUR CRATES AND USE THEM LATER. THIS WAY YOU HAVE MORE POSSIBILITYS.
P.S when i am playing bm i am closing my right eye and holding my right foot xD lol.