I just say m3 isn't a primary gun because it's got too much freeze for an "all around" situation. Handgun, m4 and other low freeze guns are mainly primary. Any gun can be primary. But secondary weapons can help too.

As with candy gun.... I find it strangely below average tier. The spread on the 2 bullets are rather tight and stay close together, making it feel more like a 1 shot gun. The clip size is incredibly small, 4 shots per clip. (8 bullets) The hit box of the gummy projectiles is slightly different from the standard bullets.