Bullet drop is a mechanic in Gang Garrison that makes bullets fall to the ground and travel in an arc, rather than a straight line. Many weapons are affected by bullet drop; Minigun, Scattergun, Shotgun, Revolver (barely), Medigun to varying extents. The Detonator's mines are also affected by bullet drop, but in that case, it is more of a pure gravity effect.
Weapons such as the Sniper Rifle and the Rocket Launcher do not have bullet drop. This means that their projectiles travel in a straight line until they hit something.
Bullet drop is stronger when moving away from the direction of fire and weaker when moving in the direction of fire.
Demo mines do also have bullet drop
Normal bullets drop
Rockets have no bullet drop