"Fires a stream of slow moving projectiles that do 2 base damage" - The Seafarers Guide
The Gilead's Gun quickly fires medium sized projectiles. These projectiles deal a low amount of damage, but the real benefit of this weapon is its high rate of fire. Upgrades to the rate of fire will have a noticeable effect on this weapon, as the already high rate of fire is increased dramatically due to upgrades using percentages of a weapon's stats. It is also important to note that the projectiles from this gun have unique physics. Without testing, it appears they inherit some of the player's movement velocity(This means: if you're moving to the right while firing, your shots will drift to the right in proportion to the speed of your movement). For some players, this will make the weapon difficult to aim with.
In the current patch this weapon shares the same projectiles as Acht and Skullito. During these fights ,it can be difficult for players to discern which shots are theirs and which are coming from the boss(as they are the same color and relative size).