Gravity feed spray guns are popular because they provide a consistent and even coating. Gravity feed also eliminates the issue of paint buildup on the sides of the cup, which can occur with traditional suction feed guns. There are a few drawbacks to using a gravity feed gun, however. First, they can be heavier and more difficult to handle than suction feed guns. Second, gravity feed guns require a higher air pressure to operate properly, so they may not be ideal for use with lower-powered compressors. Finally, gravity feed guns tend to produce more overspray than suction feed guns.