I've seen a lot of people shoot the flare gun and have it land on buildings or in awkward places. This is how you shoot it straight up and have it land where you shoot it from. Just use general aim (hip fire looking straight up) and DO NOT use over the shoulder aim. You can see when you use free aim the flare gun is pointing straight up vs. aiming with over the shoulder it aims it out in front of you and generally lands randomly somewhere out in front of you like 100-200m away. Using general aim like this I have always gotten it to land right on my feet where I shot from. Happy flare gun hunting!