Core · Weapon · Rules

When rolling to inflict damage against Units, this Weapon may always succeed on a roll of X+ regardless of E or A values. This cannot be modified. This can alter the roll required for a Critical—Pen 4+ would inflict a Critical on a 6+.

Source: Dropzone Commander Rulebook 3.02 · 3.02 · p. 50 · weapon-special-rules