How do you get the machine gun in "The murder of Crows" mission into the..

I got a tip for this, if you havent completed this mission already then do this first, if you're replayin the mission then kill the guy asassin who intends on killing the president or w/e, get his suit, then kill the woman asassin wen she is in a secluded spot were no1 will see and find somewhere to hide the body, then wait till the guy with the case of diamonds(the guy in the red bird suit with the suit case), gives them to the guy in the building(mark perchezzi III or something like that), then pick up the assault rifle n the diamond case n just run to the exit thats all I did lol, stay in the crowds of people so that when the police are shooting at you they don't hit you as much, and if you jus run to the exit then you should make it, and don't try and shoot back as you will drop the diamond case.

We're talking about a non-concealable assault rifle right? If you carry a gun like that, the police are ALWAYS going to shoot you. So you'll have to kill the policemen.

I discovered this recently, there is a weapon storage container in the back alley of the book store that you can use to store the assault rifle

Run. Keep running and don't bother about the cops.

Look kill all the yellow crows that are around the buliding(except for the one that is in the front) and hide the bodies then, look behind the building is the fountain and behind the fountain is a wall and behind the wall is a hidden ICA cage and now just do what I told you kill all the crows that are around the building, but do it silently, don't alarm anyone, and just take the machine gun and put it in the hidden ICA cage and you will evade a police pursuit, lots of blood and waste of ammo and also you will not be spotted, the really hard thing is how to take the KAZO-TRG Sniper without being spotted, there you will need to kill all the policeman